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Dispersion of White Light through Prism

Which among t...

Question

Which among the following disc's appear white when it is roataing.

A

Aristotle's disc

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B

Faraday's disc

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C

Galileo's disc

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D

Newton's disc

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Solution

The correct option is D Newton's disc
Newton's disc has different segments painted in different colours. They are painted in the order of Violet, Indigo, Blue, Green, Yellow, Orange and Red. When the disc is rotating, all the colours appear to be white. Isaac Newton used this disc to demonstrate that white light is a combination of the seven different colours.

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