Question

why does Newton's colour disk show white colour when we rotate the disk?
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Answer 1

Newton's Color Disk: When rotated, appears white. ... The segments of color on the disc are apportioned so that, when the disc is rotating, an approximate white is formed by the mixing of the colors. This whiteness is never quite realized due to the impurities of the colors, but the effect is muddy white.

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Answer 2

Explanation:

the seven component colors mix and form white color. human eyes are not capable of seeing the colors separately due to the high speed.