Gr 8 Natural Sciences Ch 3.4 SUM: Visible light
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Questions and Answers

What happens to light when it hits an opaque substance?

  • It is absorbed or reflected by the substance (correct)
  • It changes direction and speed
  • It disappears into thin air
  • It passes through the substance

    • What is the term for substances that allow most of the light to pass through?

  • Reflective
  • Transparent (correct)
  • Translucent
  • Opaque

    • What is the purpose of a sundial's gnomon?

  • To measure the temperature
  • To absorb light
  • To cast a shadow to indicate time (correct)
  • To reflect light

    • What is the term for the process by which a material takes in light energy?

    <p>Absorption</p> Signup and view all the answers

    What happens to the colors of light that are not reflected by an object?

    <p>They are absorbed by the object</p> Signup and view all the answers

    Why do black surfaces become hotter than lighter surfaces when exposed to sunlight?

    <p>Because they absorb all colors of light</p> Signup and view all the answers

    What is the purpose of a color filter?

    <p>To allow only specific colors of light to pass through</p> Signup and view all the answers

    What happens to light when it hits a translucent substance?

    <p>It scatters in different directions</p> Signup and view all the answers

    Why do we see a ladybird's shell as red?

    <p>Because it absorbs all colors of light except red</p> Signup and view all the answers

    What is the term for the process by which light bounces off a surface?

    <p>Reflection</p> Signup and view all the answers

    What is the purpose of lining the inside of the box with black paper in a pinhole camera?

    <p>To minimize reflections</p> Signup and view all the answers

    What is the term for the range of wavelengths of light that are visible to the human eye?

    <p>Visible spectrum</p> Signup and view all the answers

    Which color has the longest wavelength and lowest frequency?

    <p>Red</p> Signup and view all the answers

    What is the term for the process of separating a wave into its constituent parts?

    <p>Dispersion</p> Signup and view all the answers

    What is the purpose of a prism in investigating the visible spectrum?

    <p>To split light into its constituent colors</p> Signup and view all the answers

    What is the term for the distance between two corresponding points on consecutive waves?

    <p>Wavelength</p> Signup and view all the answers

    What type of electromagnetic wave is used in medical imaging?

    <p>X-rays</p> Signup and view all the answers

    What is the term for the way in which something is made up?

    <p>Composition</p> Signup and view all the answers

    What is the term for light that is felt as heat and used in remote controls?

    <p>Infrared (IR) light</p> Signup and view all the answers

    What is the acronym that helps to remember the colors of the visible spectrum?

    <p>ROYGBIV</p> Signup and view all the answers

    What is the main function of the sclera in the human eye?

    <p>To protect the eye</p> Signup and view all the answers

    What happens to the pupil size in bright light?

    <p>It decreases</p> Signup and view all the answers

    What is the function of the cornea in the human eye?

    <p>To focus light</p> Signup and view all the answers

    What type of cells in the retina are sensitive to light and dark changes?

    <p>Rod cells</p> Signup and view all the answers

    What happens to light when it enters a denser medium?

    <p>It slows down</p> Signup and view all the answers

    Why does a straw appear bent in water?

    <p>Because light changes direction as it moves from water to air</p> Signup and view all the answers

    What is the name of the nerve that transmits electrical impulses from the eye to the brain?

    <p>Optic nerve</p> Signup and view all the answers

    What is the term for the bending of light as it passes from one medium to another?

    <p>Refraction</p> Signup and view all the answers

    What is the term for how much a medium slows down light?

    <p>Optical density</p> Signup and view all the answers

    What happens to white light as it passes through a prism?

    <p>It is split into its component colors</p> Signup and view all the answers

    What is the purpose of the lens in the human eye?

    <p>To focus light</p> Signup and view all the answers

    What is the purpose of converging lenses?

    <p>To focus light rays inward</p> Signup and view all the answers

    What is the role of the cone cells in the retina?

    <p>To detect colors</p> Signup and view all the answers

    What happens to light when it enters a different medium at an angle?

    <p>It is refracted</p> Signup and view all the answers

    What type of lens is used to correct near-sightedness?

    <p>Diverging lens</p> Signup and view all the answers

    Why do we see a rainbow in the sky after rain?

    <p>Because light refracts and reflects through raindrops</p> Signup and view all the answers

    What is the term for a measure of how much a medium can slow down light?

    <p>Optical density</p> Signup and view all the answers

    What is the term for the bending of light as it moves from one medium to another?

    <p>Refraction</p> Signup and view all the answers

    What is the purpose of lenses in optical devices?

    <p>To focus or disperse light</p> Signup and view all the answers

    Why do legs appear shorter when viewed in a pool?

    <p>Because light refracts as it moves from water to air</p> Signup and view all the answers

    What is the primary function of a black surface in terms of light?

    <p>To absorb all colors of light</p> Signup and view all the answers

    Why do white objects reflect most of the light energy?

    <p>To maintain a cooler temperature</p> Signup and view all the answers

    What is the purpose of a solar panel being black?

    <p>To absorb the maximum amount of light</p> Signup and view all the answers

    Why do blackboards absorb most of the light?

    <p>To absorb most of the light, making it easier to see chalk writing</p> Signup and view all the answers

    What is the term for the ray of light that strikes a surface?

    <p>Incident Ray</p> Signup and view all the answers

    What is the angle between the incident ray and the normal line?

    <p>Angle of Incidence</p> Signup and view all the answers

    What is the result of the law of reflection?

    <p>The angle of incidence is equal to the angle of reflection</p> Signup and view all the answers

    What is the characteristic of a smooth surface in terms of reflection?

    <p>Reflects light uniformly</p> Signup and view all the answers

    What is the purpose of a ladybird's red shell?

    <p>To reflect red light</p> Signup and view all the answers

    What is the characteristic of a rough surface in terms of reflection?

    <p>Scatters light in different directions</p> Signup and view all the answers

    What is the primary source of natural light on Earth?

    <p>The Sun</p> Signup and view all the answers

    What is the term for objects that emit light?

    <p>Luminous</p> Signup and view all the answers

    What is the speed of light?

    <p>300,000 kilometers per second</p> Signup and view all the answers

    How long does it take for light to travel from the Sun to the Earth?

    <p>8 minutes</p> Signup and view all the answers

    What is the purpose of a pinhole camera?

    <p>To demonstrate how light travels</p> Signup and view all the answers

    What is used to cover the hole in the pinhole camera?

    <p>Aluminum foil</p> Signup and view all the answers

    What is the term for the transfer of energy through space as electromagnetic waves?

    <p>Radiation</p> Signup and view all the answers

    What does the Moon do with the light from the Sun?

    <p>Reflects light from the Sun</p> Signup and view all the answers

    What is the primary source of natural light on Earth?

    <p>The Sun</p> Signup and view all the answers

    What is the term for objects that emit light?

    <p>Luminous</p> Signup and view all the answers

    What is the speed of light in kilometers per second?

    <p>300,000</p> Signup and view all the answers

    What is the purpose of a pinhole camera?

    <p>To demonstrate how light travels in straight lines</p> Signup and view all the answers

    What material is used to cover the hole in the pinhole camera?

    <p>Aluminum foil</p> Signup and view all the answers

    What is the term for the action of light traveling through space?

    <p>Propagation</p> Signup and view all the answers

    How long does it take for light to travel from the Sun to the Earth?

    <p>8 minutes</p> Signup and view all the answers

    What is the term for the movement of light in a straight line?

    <p>Rectilinear</p> Signup and view all the answers

    What happens when light hits a transparent substance?

    <p>It passes through the substance with little absorption or reflection</p> Signup and view all the answers

    What is the purpose of using transparent objects as filters?

    <p>To allow only specific colors of light to pass through</p> Signup and view all the answers

    What is the characteristic of an opaque substance?

    <p>It does not allow light to pass through</p> Signup and view all the answers

    What happens when light hits a translucent substance?

    <p>It is scattered in different directions</p> Signup and view all the answers

    Why do we see objects clearly through transparent materials?

    <p>Because they allow most of the light to pass through</p> Signup and view all the answers

    What is the purpose of a sundial?

    <p>To measure time using shadows</p> Signup and view all the answers

    What happens when an opaque object blocks the path of light?

    <p>It creates a shadow on the surface behind it</p> Signup and view all the answers

    What is the characteristic of a black surface in terms of light?

    <p>It absorbs all colors of light</p> Signup and view all the answers

    Why do we see a leaf as green?

    <p>Because it absorbs all colors of light except green</p> Signup and view all the answers

    What is the purpose of using color filters?

    <p>To transmit only specific colors of light</p> Signup and view all the answers

    What is the purpose of the iris in the eye?

    <p>To control the amount of light entering the eye</p> Signup and view all the answers

    What happens to light when it passes from air into water?

    <p>It is refracted, or bent</p> Signup and view all the answers

    What is the role of the retina in the process of vision?

    <p>To convert light into electrical signals</p> Signup and view all the answers

    What is the term for the process by which light is focused onto the retina?

    <p>Focusing</p> Signup and view all the answers

    What is the function of the optic nerve in the process of vision?

    <p>To transmit electrical signals from the eye to the brain</p> Signup and view all the answers

    What is the difference between rods and cones in the retina?

    <p>Rods are sensitive to light and dark changes, while cones are sensitive to color</p> Signup and view all the answers

    What happens to the image formed on the retina when it is transmitted to the brain?

    <p>It is interpreted as a visual image</p> Signup and view all the answers

    What is the term for the process by which an object appears to be a different color due to the wavelengths of light it reflects?

    <p>Color Perception</p> Signup and view all the answers

    What is the purpose of the lens in the human eye?

    <p>To focus light onto the retina</p> Signup and view all the answers

    What is the term for the angle at which light enters a medium?

    <p>Angle of incidence</p> Signup and view all the answers

    What is the primary reason why black surfaces absorb more heat than white surfaces?

    <p>Because they absorb more light energy and convert it into heat</p> Signup and view all the answers

    What is the purpose of a solar panel's black surface?

    <p>To absorb maximum light energy and convert it into electrical energy</p> Signup and view all the answers

    Why do mirrors provide a clear reflection of objects?

    <p>Because they reflect all light energy</p> Signup and view all the answers

    What is the term for the imaginary line perpendicular to the surface at the point of incidence?

    <p>Normal Line</p> Signup and view all the answers

    What is the result of the law of reflection?

    <p>The angle of incidence is equal to the angle of reflection</p> Signup and view all the answers

    What is the characteristic of a smooth surface in terms of reflection?

    <p>Reflects light energy uniformly</p> Signup and view all the answers

    Why do white objects appear white?

    <p>Because they reflect all light energy</p> Signup and view all the answers

    What is the purpose of a ladybird's red shell?

    <p>To reflect red light and absorb other colors</p> Signup and view all the answers

    Why do blackboards appear black?

    <p>Because they absorb all light energy and convert it into heat</p> Signup and view all the answers

    What is the characteristic of a rough surface in terms of reflection?

    <p>Scatters light energy in different directions</p> Signup and view all the answers

    What happens to light when it travels from a less dense medium to a denser medium?

    <p>It slows down and bends towards the normal line.</p> Signup and view all the answers

    Why do we see a rainbow in the sky after rain?

    <p>Because of the refraction of light as it enters a raindrop.</p> Signup and view all the answers

    What is the purpose of a converging lens?

    <p>To bend light rays inward to a focal point.</p> Signup and view all the answers

    What happens to white light as it passes through a prism?

    <p>It is refracted and dispersed into its component colors.</p> Signup and view all the answers

    Why do legs appear shorter when viewed in a pool?

    <p>Because of the refraction of light as it moves from water to air.</p> Signup and view all the answers

    What is the relationship between the speed of light and the density of a medium?

    <p>The denser the medium, the slower the light travels.</p> Signup and view all the answers

    What is the purpose of a diverging lens?

    <p>To bend light rays outward, making them spread apart.</p> Signup and view all the answers

    Why is a straw in a glass of water bent?

    <p>Because of the refraction of light as it moves from water to air.</p> Signup and view all the answers

    What is the term for the mass per unit volume of a substance?

    <p>Density</p> Signup and view all the answers

    What is the purpose of corrective lenses?

    <p>To correct vision problems such as near-sightedness and far-sightedness.</p> Signup and view all the answers

    What is the purpose of sealing the pinhole camera box?

    <p>To allow less light to enter the box</p> Signup and view all the answers

    What is the range of wavelengths of light that are visible to the human eye?

    <p>400-700 nanometers</p> Signup and view all the answers

    What is the term for the process of separating a wave into its constituent parts?

    <p>Dispersion</p> Signup and view all the answers

    What is the characteristic of red light in the visible spectrum?

    <p>Longest wavelength, lowest frequency</p> Signup and view all the answers

    What is the purpose of a prism in investigating the visible spectrum?

    <p>To separate white light into its constituent colors</p> Signup and view all the answers

    What type of electromagnetic wave is used in remote controls?

    <p>Infrared (IR) Light</p> Signup and view all the answers

    What is the term for the distance between two corresponding points on consecutive waves?

    <p>Wavelength</p> Signup and view all the answers

    What is the purpose of a glass prism in the activity investigating the visible spectrum?

    <p>To separate white light into its constituent colors</p> Signup and view all the answers

    What is the term for the range of electromagnetic waves that are visible to the human eye?

    <p>Visible Spectrum</p> Signup and view all the answers

    What is the result of shining white light through a prism?

    <p>The light is separated into its constituent colors</p> Signup and view all the answers

    What is the primary source of natural light on Earth?

    <p>The Sun</p> Signup and view all the answers

    What is the term for objects that emit light?

    <p>Luminous</p> Signup and view all the answers

    What is the speed of light in kilometers per second?

    <p>300,000</p> Signup and view all the answers

    What is the purpose of the aluminum foil in the pinhole camera?

    <p>To create a pinhole</p> Signup and view all the answers

    What is the term for the transfer of energy through space as electromagnetic waves?

    <p>Radiation</p> Signup and view all the answers

    What is the term for the action of light traveling through space?

    <p>Propagation</p> Signup and view all the answers

    What is the term for moving in a straight line?

    <p>Rectilinear</p> Signup and view all the answers

    What is the purpose of the white paper in the pinhole camera?

    <p>To create an image</p> Signup and view all the answers

    What is the main reason for light refraction?

    <p>Light travels at different speeds in different media.</p> Signup and view all the answers

    What happens to light as it moves from a less dense medium to a denser medium?

    <p>It slows down.</p> Signup and view all the answers

    What is the term for how much a medium slows down light?

    <p>Optical density</p> Signup and view all the answers

    What is the purpose of a converging lens?

    <p>To focus light rays inward</p> Signup and view all the answers

    What is responsible for the separation of white light into its component colors?

    <p>Dispersion</p> Signup and view all the answers

    What type of lens is used to correct far-sightedness?

    <p>Converging lens</p> Signup and view all the answers

    What is the main function of the retina in the human eye?

    <p>To convert light into electrical signals</p> Signup and view all the answers

    What happens to light when it passes from air into water?

    <p>It changes direction</p> Signup and view all the answers

    What happens to light as it exits a denser medium into a less dense medium?

    <p>It bends away from the normal line</p> Signup and view all the answers

    What is the result of refraction in a rainbow?

    <p>White light is refracted and split into its component colors</p> Signup and view all the answers

    What is the purpose of the cornea in the human eye?

    <p>To focus light onto the retina</p> Signup and view all the answers

    What determines the color of an object?

    <p>The wavelength of light reflected by the object</p> Signup and view all the answers

    What is the purpose of lenses in microscopes?

    <p>To magnify images</p> Signup and view all the answers

    What causes a straw to appear bent in water?

    <p>Refraction of light</p> Signup and view all the answers

    What happens to the electrical impulses generated by the retina?

    <p>They are transmitted to the brain</p> Signup and view all the answers

    What is the term for the process by which light is focused onto the retina?

    <p>Focusing</p> Signup and view all the answers

    What is the purpose of the iris in the human eye?

    <p>To regulate pupil size</p> Signup and view all the answers

    What is the term for the light-sensitive cells in the retina?

    <p>Photoreceptor cells</p> Signup and view all the answers

    What is the purpose of the lens in the human eye?

    <p>To focus light onto the retina</p> Signup and view all the answers

    What is the term for the path that light takes as it enters the eye?

    <p>Optical path</p> Signup and view all the answers

    What is the primary characteristic of opaque substances?

    <p>They reflect or absorb all the light that hits them</p> Signup and view all the answers

    What is the purpose of a transparent object as a filter?

    <p>To allow only specific colors of light to pass through</p> Signup and view all the answers

    What happens to the colors of light that are absorbed by an object?

    <p>They are converted into other forms of energy</p> Signup and view all the answers

    What is the term for the process by which light is scattered in different directions?

    <p>Scattering</p> Signup and view all the answers

    What is the characteristic of a material that absorbs all colors of light and reflects none?

    <p>It appears black</p> Signup and view all the answers

    What is the purpose of a sundial?

    <p>To tell the time of day</p> Signup and view all the answers

    What is the term for the process by which a material takes in light energy?

    <p>Absorption</p> Signup and view all the answers

    What is the characteristic of a translucent substance?

    <p>It transmits some light but not enough to see through clearly</p> Signup and view all the answers

    What is the result of an object blocking the path of light?

    <p>It creates a shadow</p> Signup and view all the answers

    What is the term for the process by which light passes through a material?

    <p>Transmission</p> Signup and view all the answers

    What is the main purpose of a pinhole camera?

    <p>To project an inverted image of an object</p> Signup and view all the answers

    What is the result of dispersion of light when it passes through a prism?

    <p>The light is separated into its constituent colors</p> Signup and view all the answers

    What is the wavelength of violet light?

    <p>~400 nanometers</p> Signup and view all the answers

    What is the purpose of a white screen in the activity to investigate the visible spectrum?

    <p>To project the spectrum of colors onto a surface</p> Signup and view all the answers

    What type of electromagnetic wave is used in remote controls and thermal imaging?

    <p>Infrared (IR) light</p> Signup and view all the answers

    What is the term for the process of light bending as it passes from one medium to another?

    <p>Refraction</p> Signup and view all the answers

    What is the frequency of violet light?

    <p>Highest frequency</p> Signup and view all the answers

    What is the purpose of a prism in the activity to investigate the visible spectrum?

    <p>To separate the light into its constituent colors</p> Signup and view all the answers

    What is the range of wavelengths of light that are visible to the human eye?

    <p>400-700 nanometers</p> Signup and view all the answers

    What is the term for the distance between two corresponding points on consecutive waves?

    <p>Wavelength</p> Signup and view all the answers

    What happens when light hits a black object?

    <p>It absorbs all the light energy</p> Signup and view all the answers

    Why do we see a mirror image in a still lake?

    <p>Because the lake reflects light, creating a mirror image</p> Signup and view all the answers

    What is the purpose of the normal line in understanding reflection?

    <p>To draw a perpendicular line to the surface</p> Signup and view all the answers

    What is the law of reflection?

    <p>The angle of incidence is equal to the angle of reflection</p> Signup and view all the answers

    What is the characteristic of a smooth surface in terms of reflection?

    <p>It reflects light uniformly</p> Signup and view all the answers

    Why do white objects appear white?

    <p>Because they reflect all the light energy</p> Signup and view all the answers

    What is the purpose of a black surface in a solar panel?

    <p>To absorb most of the light energy</p> Signup and view all the answers

    What happens when light hits a green leaf?

    <p>It reflects green light and absorbs other colors</p> Signup and view all the answers

    Why do we see a clear reflection in a mirror?

    <p>Because the mirror is designed to reflect light with minimal absorption</p> Signup and view all the answers

    What is the result of the law of reflection?

    <p>The reflected rays are parallel, creating a clear and focused image</p> Signup and view all the answers

    What is the primary function of the pupil in the human eye?

    <p>To control the amount of light entering the eye</p> Signup and view all the answers

    What is the role of the lens in the process of vision?

    <p>To focus light onto the retina</p> Signup and view all the answers

    What is the primary characteristic of luminous objects?

    <p>They emit light, making them visible.</p> Signup and view all the answers

    What is the result of diffused reflection?

    <p>Light is reflected in multiple directions</p> Signup and view all the answers

    What can be demonstrated using a simple pinhole camera?

    <p>How light travels in a straight line.</p> Signup and view all the answers

    What is the term for the light-sensitive cells in the retina?

    <p>Photoreceptor cells</p> Signup and view all the answers

    What is the purpose of the optic nerve?

    <p>To transmit electrical impulses to the brain</p> Signup and view all the answers

    What is the term for the transfer of energy through space as electromagnetic waves?

    <p>Radiation</p> Signup and view all the answers

    What is the term for the bending of light as it passes from one medium to another?

    <p>Refraction</p> Signup and view all the answers

    What is the speed of light in kilometers per second?

    <p>300,000</p> Signup and view all the answers

    What is the role of the retina in the process of vision?

    <p>To convert light into electrical signals</p> Signup and view all the answers

    What is the reason why we rely on artificial light sources?

    <p>The Sun is not always visible.</p> Signup and view all the answers

    What is the purpose of using black paper in a pinhole camera?

    <p>To absorb light.</p> Signup and view all the answers

    What is the term for the measure of how much a medium can slow down light?

    <p>Optical density</p> Signup and view all the answers

    What happens to light when it enters a denser medium at an angle?

    <p>It slows down</p> Signup and view all the answers

    What is the time it takes for light to travel from the Sun to the Earth?

    <p>8 minutes</p> Signup and view all the answers

    What is the term for the action of light traveling through space?

    <p>Propagation</p> Signup and view all the answers

    What is the purpose of the cornea in the human eye?

    <p>To focus light onto the retina</p> Signup and view all the answers

    What is the primary reason why we can see objects clearly through transparent materials?

    <p>Because they transmit most of the light</p> Signup and view all the answers

    What is the main difference between opaque and transparent substances?

    <p>Their ability to transmit light</p> Signup and view all the answers

    What happens to light when it hits a translucent substance?

    <p>It is transmitted partially</p> Signup and view all the answers

    What is the purpose of using a color filter in photography and stage lighting?

    <p>To transmit only specific colors of light</p> Signup and view all the answers

    What happens to the colors of light that are absorbed by an object?

    <p>They are converted into other forms of energy</p> Signup and view all the answers

    Why do we see a green leaf as green?

    <p>Because it absorbs all colors of light except green</p> Signup and view all the answers

    What is the main difference between reflection and absorption of light?

    <p>Reflection occurs when light is bounced back, while absorption occurs when light is converted into other forms of energy</p> Signup and view all the answers

    What is the purpose of a sundial?

    <p>To tell time using the shadow of a object</p> Signup and view all the answers

    What is the result of the interaction between light and an opaque object?

    <p>The light is absorbed by the object and converted into heat</p> Signup and view all the answers

    What is the characteristic of a translucent substance?

    <p>It allows some of the light to pass through</p> Signup and view all the answers

    What is the primary mechanism by which a prism disperses white light?

    <p>Refraction of light as it passes through the prism</p> Signup and view all the answers

    What is the purpose of using a white screen or paper in the investigation of the visible spectrum?

    <p>To project the spectrum of colors onto a larger surface</p> Signup and view all the answers

    What is the characteristic of light that is visible to the human eye?

    <p>It has a wavelength between 400-700 nanometers</p> Signup and view all the answers

    What is the purpose of using a pinhole camera?

    <p>To invert the image of an object</p> Signup and view all the answers

    What is the term for the process by which white light is split into its constituent colors?

    <p>Dispersion</p> Signup and view all the answers

    What is the range of wavelengths of X-rays?

    <p>10^-10 - 10^-8 meters</p> Signup and view all the answers

    What is the purpose of using a dark room in the investigation of the visible spectrum?

    <p>To minimize external light sources</p> Signup and view all the answers

    What is the characteristic of infrared light?

    <p>It is felt as heat and used in remote controls</p> Signup and view all the answers

    What is the term for the distance between two consecutive peaks or troughs of a wave?

    <p>Wavelength</p> Signup and view all the answers

    What is the purpose of using a light source in the investigation of the visible spectrum?

    <p>To produce a spectrum of colors</p> Signup and view all the answers

    What is the primary reason why black objects appear hotter than lighter objects in sunlight?

    <p>Because they absorb more light energy</p> Signup and view all the answers

    What is the purpose of the normal line in understanding reflection?

    <p>To draw a perpendicular line to the surface at the point of incidence</p> Signup and view all the answers

    What is the main difference between a smooth surface and a rough surface in terms of reflection?

    <p>Smooth surfaces reflect light uniformly, while rough surfaces scatter light in different directions</p> Signup and view all the answers

    What causes the change in direction of light when it travels from one medium to another?

    <p>The change in speed of light</p> Signup and view all the answers

    What is the purpose of a whiteboard in a classroom?

    <p>To reflect most of the light, making marker writing stand out</p> Signup and view all the answers

    What happens to the light that is not reflected by an object?

    <p>It is absorbed by the object</p> Signup and view all the answers

    What is the role of the normal line in the context of refraction?

    <p>It is the line that light bends towards</p> Signup and view all the answers

    What is the main advantage of wearing white clothes on a sunny day?

    <p>It reflects more light energy</p> Signup and view all the answers

    What is the term for the spreading of light into its component colors?

    <p>Dispersion</p> Signup and view all the answers

    What is the purpose of a mirror in everyday life?

    <p>To reflect most of the light</p> Signup and view all the answers

    What type of lens is used to correct far-sightedness?

    <p>Converging lens</p> Signup and view all the answers

    What is the primary reason why solar panels are usually black?

    <p>Because they absorb more light energy</p> Signup and view all the answers

    What is the purpose of a converging lens in optical devices?

    <p>To focus light rays to a point</p> Signup and view all the answers

    What happens to the light rays when they pass through a diverging lens?

    <p>They spread apart</p> Signup and view all the answers

    What is the characteristic of a white object in terms of reflection?

    <p>It reflects all colors</p> Signup and view all the answers

    What is the primary function of the ladybird's red shell?

    <p>To reflect red light and absorb other colors</p> Signup and view all the answers

    What is the term for the measure of how much a medium slows down light?

    <p>Optical density</p> Signup and view all the answers

    What is the role of the prism in investigating the visible spectrum?

    <p>It separates white light into its component colors</p> Signup and view all the answers

    What is the result of the refraction of light as it passes through a raindrop?

    <p>The light is split into its component colors</p> Signup and view all the answers

    What is the purpose of lenses in optical devices such as glasses and microscopes?

    <p>To focus or disperse light</p> Signup and view all the answers

    What is the primary reason why black surfaces absorb more heat than white surfaces?

    <p>Because black surfaces absorb all the light energy and convert it into heat</p> Signup and view all the answers

    What is the term for the imaginary line drawn perpendicular to a surface at the point of incidence?

    <p>Normal line</p> Signup and view all the answers

    What is the purpose of using a black surface in a solar panel?

    <p>To absorb most of the sunlight and convert it into electrical energy</p> Signup and view all the answers

    What is the characteristic of a smooth surface in terms of reflection?

    <p>The reflected rays are parallel, creating a clear and focused image</p> Signup and view all the answers

    What is the law of reflection?

    <p>The angle of incidence is equal to the angle of reflection</p> Signup and view all the answers

    What is the result of the law of reflection?

    <p>The reflected rays are parallel, creating a clear and focused image</p> Signup and view all the answers

    What is the primary reason for sealing the pinhole camera box?

    <p>To allow only light to enter through the pinhole</p> Signup and view all the answers

    Which of the following types of electromagnetic waves has a shorter wavelength than visible light?

    <p>Ultraviolet Light</p> Signup and view all the answers

    What is the term for the process by which white light is separated into its constituent colors?

    <p>Dispersion</p> Signup and view all the answers

    What is the primary function of the iris in the human eye?

    <p>To control the amount of light entering the eye</p> Signup and view all the answers

    Which of the following colors of the visible spectrum has the highest frequency?

    <p>Violet</p> Signup and view all the answers

    What is the role of the lens in the process of vision?

    <p>To focus light onto the retina</p> Signup and view all the answers

    What is the term for the process of converting light energy into electrical nerve impulses?

    <p>Photoreception</p> Signup and view all the answers

    What is the purpose of a prism in the investigation of the visible spectrum?

    <p>To separate light into its constituent colors</p> Signup and view all the answers

    What is the characteristic of a rough surface in terms of reflection?

    <p>Diffuse reflection</p> Signup and view all the answers

    What is the term for the range of wavelengths of light that are not visible to the human eye?

    <p>Electromagnetic Spectrum</p> Signup and view all the answers

    What is the term for the measure of how much a medium slows down light?

    <p>Optical density</p> Signup and view all the answers

    What is the result of light entering a denser medium at an angle?

    <p>The light is refracted and changes direction</p> Signup and view all the answers

    What is the primary reason for light refraction?

    <p>Light travels at different speeds in different media</p> Signup and view all the answers

    What is the effect of refraction on white light as it passes through a prism?

    <p>It splits into its component colors</p> Signup and view all the answers

    What is the purpose of a converging lens?

    <p>To focus light rays inward</p> Signup and view all the answers

    What is the reason for the apparent bend of a straw in water?

    <p>Refraction of light from air to water</p> Signup and view all the answers

    What is the result of light entering a denser medium at an angle?

    <p>It speeds up and bends towards the normal line</p> Signup and view all the answers

    What is the term for the measure of how much a medium slows down light?

    <p>Optical density</p> Signup and view all the answers

    What is the purpose of corrective lenses for near-sightedness?

    <p>To spread light rays apart</p> Signup and view all the answers

    What is the result of light refraction and reflection in a raindrop?

    <p>A dispersion of light into its component colors</p> Signup and view all the answers

    What is the purpose of lenses in optical devices?

    <p>To focus or disperse light</p> Signup and view all the answers

    What is the reason for the formation of a rainbow in the sky after rain?

    <p>Refraction and reflection of light in raindrops</p> Signup and view all the answers

    What is the reason behind the visibility of objects through transparent substances?

    <p>The transmission of most of the light with little absorption or reflection</p> Signup and view all the answers

    What is the primary function of a color filter?

    <p>To transmit only specific colors of light</p> Signup and view all the answers

    What is the reason behind the creation of shadows?

    <p>The absorption of light by opaque objects</p> Signup and view all the answers

    What happens to the colors of light that are absorbed by an object?

    <p>They are converted into other forms of energy</p> Signup and view all the answers

    What is the characteristic of translucent substances?

    <p>They scatter light in different directions</p> Signup and view all the answers

    What is the result of the absorption of all colors of light by an object?

    <p>The object appears black</p> Signup and view all the answers

    What is the primary characteristic that defines a luminous object?

    <p>It emits light, making it a source of light</p> Signup and view all the answers

    What is the term for the transfer of energy through space as electromagnetic waves?

    <p>Radiation</p> Signup and view all the answers

    What is the purpose of using a pinhole camera in the activity described?

    <p>To understand how light travels in straight lines through space</p> Signup and view all the answers

    What is the speed of light in kilometers per second?

    <p>300,000 km/s</p> Signup and view all the answers

    How long does it take for light to travel from the Sun to the Earth?

    <p>8 minutes</p> Signup and view all the answers

    What is the term for the movement of light in a straight line through space?

    <p>Rectilinear</p> Signup and view all the answers

    What is the reason why black objects absorb more heat?

    <p>They absorb all light energy and convert it into heat</p> Signup and view all the answers

    What is the purpose of a ladybird's red shell?

    <p>To reflect red light</p> Signup and view all the answers

    What happens to light when it hits a black surface?

    <p>It absorbs all light</p> Signup and view all the answers

    What is the characteristic of a smooth surface in terms of reflection?

    <p>It reflects light uniformly</p> Signup and view all the answers

    What is the term for the ray of light that bounces off a surface?

    <p>Reflected ray</p> Signup and view all the answers

    What happens to light when it travels from a less dense medium to a denser medium?

    <p>It slows down and bends towards the normal line</p> Signup and view all the answers

    What is the primary function of a converging lens?

    <p>To bend light rays inward to a focal point</p> Signup and view all the answers

    What causes the separation of white light into its component colors?

    <p>Refraction and dispersion</p> Signup and view all the answers

    Why do legs appear shorter when viewed in a pool?

    <p>Due to the refraction of light as it passes from water to air</p> Signup and view all the answers

    What is the term for the measure of how much a medium slows down light?

    <p>Optical density</p> Signup and view all the answers

    What is the main function of the pupil in the human eye?

    <p>To control the amount of light entering the eye</p> Signup and view all the answers

    What happens to light when it hits a rough surface?

    <p>It is reflected in a diffuse manner</p> Signup and view all the answers

    What is the function of the lens in the human eye?

    <p>To focus light onto the retina</p> Signup and view all the answers

    What is the term for the process of light bending as it passes from one medium to another?

    <p>Refraction</p> Signup and view all the answers

    What is the function of the retina in the human eye?

    <p>To detect light and convert it into electrical signals</p> Signup and view all the answers

    What happens when light hits an object?

    <p>The object can either absorb, reflect, or transmit the light</p> Signup and view all the answers

    What type of substances allow us to see objects clearly through them?

    <p>Transparent substances</p> Signup and view all the answers

    What is the purpose of using a filter in photography?

    <p>To allow only specific colors of light to pass through</p> Signup and view all the answers

    Why do we see the color of an object?

    <p>Because the object absorbs some colors and reflects others</p> Signup and view all the answers

    What is the result of light passing through a translucent substance?

    <p>The light is scattered in different directions</p> Signup and view all the answers

    What type of object is the Sun?

    <p>Luminous</p> Signup and view all the answers

    What is the term for the transfer of energy through space as electromagnetic waves?

    <p>Radiation</p> Signup and view all the answers

    What is the purpose of a pinhole camera?

    <p>To demonstrate how light travels in straight lines</p> Signup and view all the answers

    What is the speed of light?

    <p>300,000 kilometers per second</p> Signup and view all the answers

    What is the term for objects that emit light?

    <p>Luminous</p> Signup and view all the answers

    What is the purpose of sealing the pinhole camera box?

    <p>To prevent light from entering the box except through the pinhole</p> Signup and view all the answers

    What happens when light passes through a prism?

    <p>It is dispersed into its constituent colors</p> Signup and view all the answers

    Which type of electromagnetic wave has a shorter wavelength and higher frequency than visible light?

    <p>Ultraviolet (UV) light</p> Signup and view all the answers

    What is the term for the range of wavelengths of light that are visible to the human eye?

    <p>Visible spectrum</p> Signup and view all the answers

    What is the term for the distance between two corresponding points on consecutive waves?

    <p>Wavelength</p> Signup and view all the answers

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