CLASS 8 PHYSICS LIGHT

In which medium does light travel the fastest?

Which of the following is NOT a characteristic of refraction of light?

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

When a ray of light travels from a denser medium to a rarer medium, it bends:

Why does a straight stick appear bent when partially submerged in water?

Which of the following statements is TRUE about the speed of light?

Why does the sun appear to be above the horizon even when it is actually below the horizon?

What is the term used to describe the change in direction of light when it passes from one medium to another?

What is the phenomenon called where an inverted image of a tree is seen in a desert, giving a false impression of water?

What is the primary reason for the formation of a mirage?

In a desert, what happens to the direction of light rays as they travel from hotter, rarer air to colder, denser air?

What happens to the light rays in a mirage when the angle of incidence becomes 90 degrees?

What is the phenomenon called when white light is split into its constituent colors?

What is the name of the colored band produced when white light passes through a prism?

Which of the following colors is NOT a constituent color of white light?

What happens to the seven colors of white light when they are combined?

Which of the following is a law of reflection?

What is the geometric center of the spherical surface of a mirror called?

What is the point on the principal axis of a concave mirror where parallel light rays meet after reflection called?

What is the distance between the pole of a mirror and its focus called?

Which type of mirror always forms an erect and virtual image?

Which type of mirror can be used as a shaving mirror?

Which type of mirror is used as a rearview mirror in vehicles?

Which type of mirror is used by a dentist to concentrate light on a small area?

Which type of mirror is used as a reflector in street lamps?

What causes a straight stick to appear bent when partially submerged in water?

Which of the following correctly describes the relationship between a ray of light and the normal at the point of incidence?

What is the relationship between the speed of light and the density of the medium it travels through?

When light travels from a denser medium to a rarer medium, what happens to its direction?

Which of the following statements accurately describes the relationship between the speed of light and its path in a medium?

What is the term used to describe the ray of light that travels in the medium after it has been refracted?

What causes the light rays to bend when forming a mirage?

What happens to the light rays as they travel from denser to rarer air in a mirage?

What is the appearance of the focus in a concave mirror when a parallel beam of light hits it?

Which letters represent the center of curvature and pole in the context of a spherical mirror?

What type of image does a convex mirror always produce?

In which scenario does a concave mirror form a real image?

How does a convex mirror assist a driver?

What is the effect of persistent light rays passing through the focus of a concave mirror?

What does the focal length of a mirror refer to?

What occurs to the angle of incidence at the center of curvature of a spherical mirror?

Which best describes the appearance of an image formed by a concave mirror when the object is placed between the pole and the focus?

What specific type of optical effect do colored disks exhibit when spun rapidly?

Which use of a concave mirror is directly related to its ability to focus light?

Which of the following statements best explains why a stick partially submerged in water appears bent at the surface?

Why does the sun appear to be above the horizon even after it has actually set?

Which of the following statements correctly describes the relationship between the speed of light and the density of the medium it travels through?

Consider a ray of light traveling from air to glass. Which of the following statements about the speed of light and the bending of the ray is TRUE?

Imagine a ray of light passing from water to air. Which of the following correctly describes the change in the angle of refraction compared to the angle of incidence?

Which of the following scenarios best describes the condition necessary for the formation of a mirage?

Which of the following statements is FALSE regarding the relationship between the speed of light and its path in a medium?

Why does a pencil partially submerged in water appear to be bent at the surface of the water?

A beam of light is incident parallel to the principal axis of a convex mirror. After reflection, the beam diverges and appears to meet at a point called the focus of the convex mirror. Which of the following statements best explains why the beam appears to converge at the focus?

A prism is a transparent medium bounded by five plane surfaces with a triangular cross section. Which of the following statements best describes the role of the triangular cross section in the dispersion of white light?

A concave mirror is used as a shaving mirror. Which of the following properties of concave mirrors is most directly relevant to this use?

A convex mirror is often used as a rearview mirror in vehicles. Which property of convex mirrors makes them particularly suitable for this purpose?

A ray of light passing through the center of curvature of a spherical mirror is reflected along its own path. What is the primary reason for this phenomenon?

A mirage in a desert is formed due to the refraction of light. What causes the light rays to refract, creating the illusion of water?

When white light is split into its constituent colors by passing through a prism, which color undergoes the most refraction?

A concave mirror forms an erect, virtual, and enlarged image of an object. Where must the object be placed relative to the mirror to achieve this?

A convex mirror always forms an erect and virtual image. Why is the image always smaller than the object?

A dentist uses a concave mirror to concentrate light on a small area to be examined, like teeth. Which property of concave mirrors allows for this concentration of light?

The two laws of reflection state that the angle of incidence is equal to the angle of reflection, and that the incident ray, the reflected ray, and the normal all lie in the same plane. Which of the following scenarios would violate these laws?

The phenomenon of dispersion of white light into its constituent colors when passing through a prism is primarily a result of which of the following?

A convex mirror is used as a reflector in street lamps. What is the main advantage of using a convex mirror for this purpose?

A ray of light is incident on a spherical mirror at a point other than the center of curvature. Which of the following statements correctly describes the angle of incidence and the angle of reflection?

Which of the following statements accurately describes the difference between a real image and a virtual image in the context of mirrors?

A rapidly rotating disc appears white because the seven colors of white light are its constituent colors. Which of the following statements best explains why this is the case?

Which of the following correctly explains why the sun appears to be above the horizon even after it has actually set?

Suppose you're standing on a beach and observe a distant boat. The boat appears to be floating higher than its actual position. Which of the following best explains this phenomenon?

Considering the speed of light in different media, which of the following statements accurately describes the relationship between the speed of light and the density of the medium it travels through?

A scientist observes a ray of light passing from air into a glass prism. The ray bends as it enters the prism. Which of the following correctly describes the change in the speed of light and the direction of bending as it enters the prism?

A ray of light is traveling through air and strikes a smooth, flat surface of water. The angle of incidence is 30 degrees. What will happen to the angle of refraction, and why?

Which of the following statements correctly explains why a stick partially submerged in water appears bent at the surface?

Which of the following statements accurately describes the relationship between the angle of incidence, angle of refraction, and the movement of light from a denser to a rarer medium in the formation of a mirage?

The phenomenon of the splitting of white light into its constituent colors is called ____, and the resulting colored band is known as a _____.

The laws of reflection state that the angle of incidence is ____ the angle of reflection and that the incident ray, reflected ray, and the normal ____ in the same plane.

A concave mirror is used by a dentist because ____, whereas a convex mirror is used as a street light reflector because ____.

Which of the following statements accurately describes the relationship between the type of image formed by a mirror and the position of the object?

A convex mirror is used as a rearview mirror in vehicles primarily because:

Which of the following statements correctly describes the focal length of a concave mirror?

Why does a white disc appear white when rotated rapidly?

In the formation of an inverted image of a tree in a mirage, which of the following factors is most responsible for the initial bending of light rays away from the normal?

A ray of light passing through the center of curvature of a spherical mirror is reflected ____.

Which of the following accurately describes the reason why a stick appears bent when partially submerged in water?

Consider a light ray traveling from a denser medium to a rarer medium. Which of the following accurately describes the relationship between the angle of incidence, angle of refraction, and speed of light?

Which of the following describes the correct order of colors in the visible spectrum of sunlight, from bottom to top as seen on a screen after passing through a prism?

Which type of mirror forms an erect and virtual image, regardless of where the object is placed, and why?

In the context of a spherical mirror, what is the relationship between the center of curvature (C) and the pole (P)?

Why does a concave mirror form an enlarged, erect, and virtual image when an object is placed between the pole and the focus?

Which of the following statements accurately describes the function of a convex mirror in a street lamp?

The ______ of light in air is 3 x 108 m s-1.

A medium is said to be ______ if the speed of light in it decreases.

The change in direction of the path of light when it passes from one optically ______ medium to another is called refraction of light.

The ray of light falling on the surface separating the two media is called the ______ ray.

The ______ between the incident ray and the normal is called the angle of incidence.

When a ray of light travels from a rarer medium to a denser medium, it bends ______ the normal.

The upper atmospheric layers are ______ than the layers near the surface of the earth before sunrise and after sunset.

Due to continuous bending of light rays the sun appears to be ______ the horizon.

A ______ is formed when a beam of light travels from a denser to a rarer medium and bends away from the normal.

The layers of air near the ground in a desert are ______ than the upper layers.

The ______ of light is the splitting of white light into its constituent colors.

The seven colors of light are referred to as ______.

The ______ is the colored band produced when white light passes through a prism.

The ______ of a mirror is the centre of the sphere of which the mirror is a part.

The ______ of a mirror is the radius of the sphere of which the mirror is a part.

A ______ mirror always forms an erect and virtual image.

A ______ mirror is used as a rearview mirror in vehicles.

A ______ mirror is used by a dentist to concentrate light on a small area.

A ______ mirror is used as a reflector in street lamps.

A ______ mirror forms an erect, virtual, and enlarged image when the object is placed between the pole and focus.

A ______ image can be obtained on a screen.

A ______ mirror is used as a shaving mirror.

A ray of light passing through the ______ of a spherical mirror is reflected along its own path.

The change in ______ of the path of light when it passes from one optically transparent medium to another is called refraction of light.

The ray of light traveling in the other medium in the changed ______ is called the refracted ray.

When a ray of light falls ______ on a glass slab the angle between incident ray and normal is 0°. So, the angle of incidence is 0°.

When a ray of light travels from a rarer medium to a denser medium, it bends ______ the normal because the speed of light decreases in denser medium.

A straight stick partly dipped in water ______, appears to be bent at the surface of water due to refraction of light.

A ______ is formed when the light rays from the sun are refracted in the desert, creating a false impression of water.

The ______ of light causes the formation of a mirage in the desert.

In a desert, the layers of air near the ground are ______ than the upper layers.

When light travels from a ______ medium to a rarer medium, it bends away from the normal.

The splitting of white light into its constituent colours is called ______ of light.

The seven colours of the rainbow, arranged from bottom to top, are known by the acronym ______.

A coloured band on a screen, obtained by passing white light through a prism, is called a ______.

When the seven colours of the spectrum are combined, they produce the effect of ______ colour.

The geometric centre of the spherical surface of a mirror is called the ______ of the mirror.

The centre of the sphere of which a mirror is a part is called the ______ of the mirror.

The focus of a concave mirror is the point where light rays incident parallel to the principal axis ______ after reflection.

A concave mirror is used by a dentist as a ______ mirror.

A convex mirror is used as a rear view mirror in vehicles because it has a wider ______ of view than a plane mirror.

Light travels slower in water than in air.

The angle of incidence is the angle between the refracted ray and the normal.

A ray of light bending towards the normal when moving from one medium to another indicates a decrease in speed.

The phenomenon of a stick appearing bent when partially submerged in water is caused by reflection of light.

The speed of light in a vacuum is approximately 3 x 10^8 m/s, and it remains constant regardless of the medium it travels through.

The sun appearing above the horizon after sunset is caused by the refraction of light through warmer air layers.

The change in the direction of light when it passes from one medium to another is called reflection.

The phenomenon of a stick appearing bent when partially submerged in water is caused by the reflection of light at the water's surface.

The phenomenon of mirage is caused by the reflection of light.

The layers of air near the ground in a desert are denser than the upper layers during the day.

The image formed by a mirage is always upright.

The angle of incidence is greater than the angle of reflection.

A prism is a transparent medium with a rectangular cross section.

The green color is at the top of the visible spectrum.

The seven colors of the visible spectrum are combined to produce black light.

The pole of a mirror is the centre of curvature of the reflecting surface.

The focal length of a concave mirror is negative.

A convex mirror can produce a real image.

The image formed by a concave mirror is always smaller than the object.

A dentist would use a convex mirror to examine teeth.

A rearview mirror in a car is a convex mirror because it provides a larger field of view.

A parallel beam of light incident on a convex mirror will converge to a point after reflection.

A concave mirror can be used as a reflector in street lamps.

The speed of light in glass is greater than the speed of light in air.

When a ray of light travels from a rarer medium to a denser medium, it bends away from the normal.

The angle of refraction is always equal to the angle of incidence, regardless of the medium.

A straight stick partially submerged in water appears bent due to the reflection of light.

The phenomenon of seeing the sun before sunrise and after sunset is due to the diffraction of light.

The speed of light remains constant, regardless of the medium it travels through.

The phenomenon of a mirage is caused by the reflection of light from a hot surface.

The reason a mirage appears to be a reflection of the sky is due to the total internal reflection of light.

The phenomenon of a mirage is primarily caused by the reflection of light.

In a desert, the layers of air closest to the ground are denser than the layers above them.

Light rays traveling from a denser medium to a rarer medium bend towards the normal.

The angle of incidence increases as the light ray continues to refract in a mirage, until the angle of refraction reaches 90 degrees.

A prism is a transparent medium bound by six plane surfaces with a triangular cross section.

The splitting of white light into its constituent colors is called diffraction of light.

The color blue is situated on the top of the visible spectrum.

The color green is not a constituent color of white light.

When the seven colors of white light are combined, they produce a black color effect.

The angle of reflection is equal to the angle of incidence.

The pole of a spherical mirror is the geometric center of the spherical surface.

The focus of a concave mirror is the point on the principal axis where light rays parallel to the axis diverge after reflection.

The distance between the pole of a mirror and its focus is called the radius of curvature.

A concave mirror always forms an erect and virtual image.

A concave mirror is typically used as a rearview mirror in vehicles.

Explain why a stick partially submerged in water appears bent at the surface.

Why does the sun appear to be above the horizon even when it is actually below the horizon (this is called a mirage)?

Explain the relationship between the speed of light and the density of a medium.

Describe the behavior of light rays when traveling from a rarer medium to a denser medium.

How is the concept of a 'normal' used in describing refraction?

How does the density of air change the path of light rays, and what effect does this have on our perception?

What is the difference between an incident ray, a refracted ray, and a normal in the context of refraction?

What is the phenomenon called when an inverted image of a tree is seen in a desert, creating the illusion of water?

How is a mirage formed? Explain the process involving light and air.

What is the name given to the splitting of white light into its constituent colors?

List the seven colors of the rainbow in the order they appear from bottom to top.

Why does a rapidly rotating disc appear white?

What are the two laws of reflection of light?

What is the name of the point on the principal axis of a concave mirror where parallel light rays meet after reflection?

What is the term for the distance between the pole of a mirror and its focus?

Why is a concave mirror used as a shaving mirror or a doctor's head mirror?

What is the advantage of using a convex mirror as a rearview mirror in a vehicle?

Describe the image formed by a convex mirror, including its size, orientation, and nature.

What happens to the light rays incident on a concave mirror when they are parallel to its principal axis?

What is the relationship between the angle of incidence and the angle of reflection for a ray of light striking a mirror?

Explain why light bends when it passes from air into water.

Describe the relationship between the speed of light and the density of the medium it travels through.

Explain how a mirage is formed in a desert.

Why does the sun appear to be above the horizon even before it rises or after it sets?

Why does a ray of light bend towards the normal when it travels from air to glass?

How does the refractive index relate to the speed of light in a medium?

Explain how the changing density of air contributes to the appearance of a mirage.

Explain the phenomenon of a mirage in a desert, including the role of refraction and the density of air layers.

Describe the process of dispersion of white light through a prism, including the resulting spectrum and the order of colors.

Explain why a rapidly rotating disc appears white even though it's made of seven colored segments.

State the two laws of reflection of light.

Define the following terms related to spherical mirrors: pole, center of curvature, radius of curvature, and principal axis.

What is the focal point (F) of a concave mirror, and how is it formed?

Explain how the focal point (F) of a convex mirror is different from that of a concave mirror, and how it is formed.

Describe the type of image formed by a convex mirror, and explain its characteristics.

When does a concave mirror form a real image, and what are its characteristics?

Explain why a concave mirror is used as a shaving mirror.

Why is a convex mirror used as a rearview mirror in cars?

Explain why dentists use concave mirrors during examinations.

Explain why convex mirrors are used as reflectors in street lamps.

Why does a straight stick appear bent when it is partially submerged in water?

Explain why the sun appears to be above the horizon even after it has actually set.

A ray of light travels from air to water. Explain why the light bends towards the normal and what happens to its speed.

During sunset, the sun appears to be above the horizon for a short period even after it has actually set. Explain the phenomenon responsible for this observation.

A straight stick partially submerged in water appears bent at the water's surface. Explain why this occurs, making sure to include the terms 'refraction' and 'normal'.

Explain how the speed of light in a medium determines whether the medium is considered optically denser or rarer.

Imagine a ray of light travelling from a denser to a rarer medium. Describe the direction of bending and the change in speed of the light.

Why does a ray of light bend towards the normal when traveling from a rarer to a denser medium?

Explain how atmospheric refraction plays a role in the phenomenon of a mirage, describing the change in density and the direction of bending of light rays.

Describe two scenarios where atmospheric refraction contributes to optical illusions observed in nature.

Explain why a mirage in a desert creates the illusion of water, considering the properties of light and how its path changes in different air densities.

Describe the process of dispersion of light, specifically addressing the role played by a prism in separating the colors of white light. What is the order of the colors in the resulting spectrum?

Why does a rapidly rotating white disc appear to be white, even though it is composed of different colored segments? Explain how this is related to the nature of white light.

Explain the difference between a concave mirror and a convex mirror in terms of their shape, focal point, and the types of images they produce.

Explain why a concave mirror is used as a shaving mirror, and why a convex mirror is used as a rearview mirror in vehicles. Relate their use to the image characteristics they form.

Describe how a concave mirror is used by a dentist to concentrate light on a small area. Why is this property useful in dental examinations?

Explain why a convex mirror is used as a street light reflector. What advantage does it offer over other mirror types?

Explain the phenomenon of reflection and its two fundamental laws, including a brief description of each law.

Contrast the properties of a real image and a virtual image formed by mirrors, highlighting the main differences between them.

Explain why the speed of light changes as it travels from one medium to another, and how this change in speed is related to the phenomenon of refraction. Relate this to the density of the medium.

Describe how the angle of incidence and the angle of refraction are related, considering the laws of refraction. Explain how the direction of light changes when traveling from a denser medium to a rarer medium.

Explain the concept of focal length in relation to mirrors. How does the focal length differ between concave and convex mirrors?

Explain why a ray of light passing through the center of curvature of a spherical mirror is reflected along its own path. How does this relate to the angle of incidence and reflection?

Explain how a convex mirror is used as a driver's rearview mirror, highlighting the advantages it offers. Elaborate on the type of image it produces and why it is beneficial for driving.

Describe the relationship between the position of an object and the type of image formed by a concave mirror. Explain why concave mirrors can produce both real and virtual images.

Explain the concept of refraction and how it contributes to the observation of a bent stick partially submerged in water. What is the perceived position of the submerged portion of the stick compared to its actual position?