a disc painted with rainbow colours, how does it appears when when it is rotated and what is the reason?
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The colors you see reflecting from a CD are interference colors, like the shifting colors you see on a soap bubble or an oil slick. You can think of light as as being made up of waves-like the waves in the ocean. When light waves reflect off the ridges on your CD, they overlap and interfere with each other.
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When rotated, appears white. ... When the motor is turned on, the disk rotates rapidly. The segments of color on thedisc are apportioned so that, when the disc isrotating, an approximate white is formed by the mixing of the colors.
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