3. What do you see on holding a CD in the sun?
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When you hold a CD under the sunlight it reflects a rainbow due to it's reflecting nature. The reflecting colors that can be seen from a CD are interference colors, for example the shifting colors that we see on a soap bubble. It can be thought of as light being made up of waves, like the waves in the ocean.
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Explanation: The reason CDs reflect rainbow colors is because they have a clear plastic coating on top of a mirrorized surface. Light refracts (bends) when it moves from one medium (such as air) to another with a different optical density (such as the clear plastic surface of a CD).
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