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Questions and Answers
Which type of light is generated by a chemical reaction?
Which type of light is generated by a chemical reaction?
What occurs when the primary colors of light are combined?
What occurs when the primary colors of light are combined?
Which two primary colors combine to create the secondary color Yellow?
Which two primary colors combine to create the secondary color Yellow?
What type of objects do not generate their own light?
What type of objects do not generate their own light?
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What does True Colour refer to?
What does True Colour refer to?
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What is a primary color of light?
What is a primary color of light?
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Which type of light is produced when argon gas and mercury react in a bulb?
Which type of light is produced when argon gas and mercury react in a bulb?
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What happens when pigments combine?
What happens when pigments combine?
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What are the primary colors used in the magenta, cyan, and yellow printer for color printing?
What are the primary colors used in the magenta, cyan, and yellow printer for color printing?
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Which of the following statements correctly describes the effect of shining white light on a cyan surface?
Which of the following statements correctly describes the effect of shining white light on a cyan surface?
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What is a key characteristic of opaque materials?
What is a key characteristic of opaque materials?
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What defines a plane mirror?
What defines a plane mirror?
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What happens when complementary colors are mixed together?
What happens when complementary colors are mixed together?
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What characterizes a converging mirror?
What characterizes a converging mirror?
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Why are governments promoting the switch from incandescent bulbs to fluorescent or LED lights?
Why are governments promoting the switch from incandescent bulbs to fluorescent or LED lights?
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Which type of light-sensitive cells in the eye are responsible for color vision?
Which type of light-sensitive cells in the eye are responsible for color vision?
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What type of image does a plane mirror produce?
What type of image does a plane mirror produce?
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What properties are described by the acronym SALT when discussing images?
What properties are described by the acronym SALT when discussing images?
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In a concave mirror, what type of image is formed when the object is placed closer than the focal point?
In a concave mirror, what type of image is formed when the object is placed closer than the focal point?
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What type of reflection occurs on a freshly waxed car's surface?
What type of reflection occurs on a freshly waxed car's surface?
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What is a characteristic of a diverging mirror?
What is a characteristic of a diverging mirror?
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Which of the following is NOT a use for converging mirrors?
Which of the following is NOT a use for converging mirrors?
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What angle is between the reflective ray and the normal in this context?
What angle is between the reflective ray and the normal in this context?
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Which of these images is correctly identified as virtual?
Which of these images is correctly identified as virtual?
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Luminous objects are those that do not generate their own light.
Luminous objects are those that do not generate their own light.
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The secondary color cyan is produced by combining blue and green light.
The secondary color cyan is produced by combining blue and green light.
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Incandescent lights are known for being very energy efficient.
Incandescent lights are known for being very energy efficient.
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Chemiluminescence occurs due to a chemical reaction that produces light.
Chemiluminescence occurs due to a chemical reaction that produces light.
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When the primary colors of light are combined, they produce black light.
When the primary colors of light are combined, they produce black light.
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Non-luminous objects can reflect light, allowing us to see them.
Non-luminous objects can reflect light, allowing us to see them.
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The primary colors of light are yellow, magenta, and cyan.
The primary colors of light are yellow, magenta, and cyan.
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Fluorescent lights use a chemical reaction to produce light efficiently.
Fluorescent lights use a chemical reaction to produce light efficiently.
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A plane mirror produces an image that is both upright and the same size as the object.
A plane mirror produces an image that is both upright and the same size as the object.
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A converging mirror is also known as a convex mirror.
A converging mirror is also known as a convex mirror.
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Cyan light will absorb red and reflect blue and green.
Cyan light will absorb red and reflect blue and green.
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Fluorescent bulbs are less efficient than incandescent bulbs.
Fluorescent bulbs are less efficient than incandescent bulbs.
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Mixing red and yellow light results in a complementary color of green.
Mixing red and yellow light results in a complementary color of green.
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White light is a mixture of all three primary colors of light.
White light is a mixture of all three primary colors of light.
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Transparent materials allow no light to pass through, making objects behind them invisible.
Transparent materials allow no light to pass through, making objects behind them invisible.
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When white light passes through a transparent filter, it appears white.
When white light passes through a transparent filter, it appears white.
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A diverging mirror is a concave mirror that produces an inverted image.
A diverging mirror is a concave mirror that produces an inverted image.
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The law of reflection states that the angle of incidence is equal to the angle of reflection.
The law of reflection states that the angle of incidence is equal to the angle of reflection.
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A plane mirror produces a real image that is smaller than the object.
A plane mirror produces a real image that is smaller than the object.
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Converging mirrors, like shaving mirrors, create virtual images.
Converging mirrors, like shaving mirrors, create virtual images.
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The acronym SALT stands for Size, Attitude, Location, and Type when discussing images.
The acronym SALT stands for Size, Attitude, Location, and Type when discussing images.
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A convex mirror produces images that are upright and located behind the mirror.
A convex mirror produces images that are upright and located behind the mirror.
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Regular reflection occurs when light rays bounce off rough surfaces.
Regular reflection occurs when light rays bounce off rough surfaces.
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An angle of incidence of 37 degrees will result in a reflective angle also of 37 degrees.
An angle of incidence of 37 degrees will result in a reflective angle also of 37 degrees.
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Study Notes
Electromagnetic Spectrum
- Radio waves, microwaves, infrared, visible light, ultraviolet light, X-rays, and gamma rays are types of energy in the electromagnetic spectrum.
- Visible light is part of the spectrum, and its colours are red, orange, yellow, green, blue, indigo, and violet (Roy G Biv).
Luminous vs. Non-Luminous Objects
- Luminous objects generate their own light (e.g., sun, light bulbs, fireflies).
- Non-luminous objects do not generate light but can reflect light from other sources (e.g., moon reflecting sunlight).
Types of Light
- Incandescent: Copper coil wires heat up to produce light (less efficient).
- Fluorescent: Argon gas and mercury react in a coated bulb (more efficient but contains mercury).
- LED (Light Emitting Diode): Very efficient and generates little heat (e.g., Christmas lights).
- Chemiluminescence: Chemical reactions produce light.
- Bioluminescence: Organisms produce their own light (e.g., fireflies, jellyfish).
Primary Colors of Light
- Red, green, and blue combine to create white light.
Secondary Colors of Light
- Red + Blue = Magenta
- Red + Green = Yellow
- Blue + Green = Cyan
True Color
- The color of an object as seen under white light.
Combining Primary Colors of Light
- Combining primary colors of light creates white light.
Combining Secondary Colors of Light
- Combining secondary colors of light creates white light because secondary colors are made up of primary colors.
Types of Mirrors
Plane Mirrors
- Flat mirrors that produce upright, virtual images of the same size as the object. The image is the same distance behind the mirror as the object is in front of it.
Concave Mirrors
- Mirrors that curve inwards and produce different types of images, based on the object's position relative to the mirror.
Convex Mirrors
- Mirrors that curve outwards and produce smaller, upright, virtual images. The image is always behind the mirror.
Mirror Uses
- Shaving mirrors
- Head mirrors
- Ophthalmoscopes
- Astronomical telescopes
- Headlights
- Solar furnaces
- Side mirrors (cars)
- Security mirrors
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Description
Explore the fascinating world of the electromagnetic spectrum, from radio waves to gamma rays. Learn the differences between luminous and non-luminous objects, and discover various types of light including incandescent, fluorescent, LED, chemiluminescence, and bioluminescence. Understand how these concepts relate to the behavior of light and energy around us.
