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"Dispersion of Light" Colorful Light PPT Courseware
After sunlight passes through a prism, it is decomposed into seven colors of light: red, orange, yellow, green, blue, indigo, and violet.
This shows that white light is a mixture of various colors of light.
If you mix two or three of the three primary colors, you can get other colors.
Discussion analysis:
1. White objects can reflect ______ color light, red objects can reflect ______ color light and absorb ______ color light.
2. Black objects will absorb ______ and cannot ______.
3. The color of opaque objects depends on ____________.
The color of a transparent object is determined by the colored light passing through it.
The color of an opaque object is determined by the colored light it reflects.
Colors are divided into warm and cold colors: yellow, orange, and red (warm); green, blue, and purple (cold)
Thinking 1. When there is no other light, the green light emitted by the stage spotlight shines on the actor wearing white clothes and red skirt. What the audience sees is: the top is ______ color and the skirt is ______ color.
2. Why are movie curtains always white?
think:
"The setting sun shines back on the Peach Blossom Crossing, and the catkins fly over in red." The catkins are as white as snow, but how can they turn red? Can you explain the physics behind this?
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