# Light and Color by fanzhongqing

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```									Light and Color

Chapter 3
Section 4
Pages 82 - 87
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Light and • When light strikes matter,
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Matter  |
it can be reflected,
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|     absorbed, or transmitted.
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|   • Transmission is the passing
|     of light through matter.
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Types of       • Visible light is easily transmitted is said
|     to be transparent.
Matter    |
Examples: air, glass, water
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|   • Transmits light and scatters the light is
said to be translucent.
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|        Example: wax paper
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|   • Does not transmit any light is said to be
|     opaque.
|         Examples: metal, wood, a book
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|   • Whether an object is transparent,
|     translucent, or opaque is determined by
|     its ability to transmit light.
| • Whether an object is transparent,
Types of   | translucent, or opaque is determined by
Matter    | its ability to transmit light.
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| • How is an object’s color determined?
Colors of   |    We see different wave lengths of light
Objects    |    as different colors.
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Red = long wavelengths
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|         Violet = short wavelengths
|         Pink or Brown = combination of
|         wavelengths
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| • Light reaches your eyes after being
Colors of   | reflected or transmitted through an object.
Objects    |
Colors of |
Opaque | • Some light is reflected some is
Objects | absorbed.
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|   • The light reflected determines
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the color.
|   • White objects reflect all colors.
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• Black objects absorb all colors.
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Colors of    |
Transparent   |   • When you look through
|     colored transparent or
And
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Translucent   |
translucent objects, you see the
Objects     |     color of light that was
|     transmitted through.
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|   • Other colors are absorbed.
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Mixing | • Red, blue, and green are
Colors of |
Light    | primary colors of light.
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|   • Combination of these three
|     colors create white light.
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|   • Colors of light combine you
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get different colors. This is
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• Two primary colors combined
|     create secondary colors –
|     magenta, yellow, cyan.
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Primary & Secondary Colors
Light and |
Color    | • Colors of color TV are
Television |
| • TV screen is made up of
| groups of tiny red, green, and
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| blue dots.
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Mixing |
Colors of | • You can’t mix red, green, and
Pigment | blue paint to create white due
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to that paint contains pigments.
|   • A pigment is a material that
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|     gives a substance its color.
|   • Mixing pigments is called
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|     color subtraction.
|   • Primary pigments are magenta,
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yellow, cyan.
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|   • Ink cartridges
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Primary & Secondary Pigments

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