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
         |     called color addition
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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
           | produced by color addition.
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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