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Chapter 2: Section 2Visible light and Color

+When light strikes an object, it is reflected, transmitted, or absorbed. Light ON Light OFF

+What is reflecting light?What is absorbing light?What is transmitting light?

+Transparent materials transmit light. You can see things on the other side of the material.

+Translucent materials scatter light. Things on the other side of the material look blurry.

+Opaque material reflects or absorbs all the light that hits it. You can’t see through it.

+What color is the apple?What color does it REFLECT? What color does it ABSORB?

+The color of an opaque object is the color of the light it REFLECTS.

+You see….The apple only looks red if it REFLECTS red light to your eye.

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+What about Black and white?

Black White

+Why can’t you see well at night?There is very little light to reflect off

objects and back to your eye. Only your most sensitive light-gathering cells are at work at night. What are they?

+Remember yesterday’s activity!

What did we investigate?

What did we find out?

+What is a prism?A transparent object which reflects and

transmits light

Visible Light

+Wavelength

Red shortest

Violet longest

+Combining Colors- LightKey Concept: When combined in equal

amounts, the three primary colors of light produce white light.

Primary colors: Red, Green, Blue

Secondary colors: Yellow, cyan, Magenta

Add up the primary colors = ?

Combining Colors- Pigments•The primary colors of pigments

combine in equal amounts to form black.Primary pigments:

Magenta, Cyan, Yellow

Secondary pigments: red, green, and blue

Add primary pigments =?