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Ch. 19 - Light PowerPoint PPT Presentation


Ch. 19 - Light. II. Light and Color (p.528-535) Light and Matter Seeing Colors Mixing Colors. A. Light and Matter. Opaque absorbs or reflects all light Transparent allows light to pass through completely Translucent allows some light to pass through. B. Seeing Colors. White light

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Ch. 19 - Light

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Ch 19 light l.jpg

Ch. 19 - Light

II. Light and Color

(p.528-535)

  • Light and Matter

  • Seeing Colors

  • Mixing Colors


A light and matter l.jpg

A. Light and Matter

  • Opaque

    • absorbs or reflects all light

  • Transparent

    • allows light to pass through completely

  • Translucent

    • allows some light to pass through


B seeing colors l.jpg

B. Seeing Colors

  • White light

    • contains all visible colors - ROY G. BIV

  • In white light, an object…

    • reflects the color you see

    • absorbs all other colors

ABSORBS

ALL COLORS

REFLECTS

ALL COLORS


B seeing colors4 l.jpg

B. Seeing Colors

  • The retina contains…

    • Rods - dim light, black & white

    • Cones - color

      • red - absorb red & yellow

      • green - absorb yellow & green

      • blue - absorb blue & violet

Stimulates red & green cones

Stimulates all cones


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Test for red-green color blindness.

B. Seeing Colors

  • Color Blindness

    • one or more sets of cones does not function properly


C mixing colors l.jpg

C. Mixing Colors

  • Primary light colors

    • red, green, blue

    • additive colors

    • combine to form white light

  • EX: computer RGBs

View Java Applet on primary light colors.


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C. Mixing Colors

  • Filter

    • transparent material that absorbs all light colors except the filter color

View Java Applet on filters.


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C. Mixing Colors

  • Pigment

    • colored material that absorbs and reflects different colors

  • Primary pigment colors

    • cyan, magenta, yellow

    • subtractive colors

    • combine to form black

  • EX: color ink cartridges


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C. Mixing Colors

Light

Pigment

When mixing pigments, the color of the mixture is the color of light that both pigments reflect.


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Negative Afterimage - One set of cones gets tired, and the remaining cones produce an image in the complimentary color.


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