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Q.

Newton’s disc appears white when it is


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a

kept in the dark

b

seen in sunlight

c

rotated

d

shaken very fast 

answer is C.

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Detailed Solution

Newton’s disc appears white when it is rotated.
Newton’s disc is a colored disc that consists of the constituent colours of the white light. These colours are the visible spectrum. When this disc is rotated at high speed, all the colours blend in, and it appears to be white colour over the disc. This disc exhibits how white light is composed of the colours of the rainbow.
 
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