Question

Why does a Newton's disc appear white when it is rotated

Answer 1

Newton's disc contained 7 colours(VIBGYOR).When he rotated the disc the colours combined to form white light as the colours are components of white light.

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Answer 2

the newton's disc is made up of seven colours.
when it is rotated fast the colour blend to form white colour due to persistence of vision.
white light is a combination of mainly 7 colours so newton wanted to prove this by Carrying out this experiment.