Which of the following can combine the seven different colours (VIBGYOR) in white light.

Prism

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Concave lens

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Convex lens

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Newton's disc

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Solution

The correct option is D Newton's disc
A Newton disc is a circular disc with seven segments and contains seven different colours (VIBGYOR). When rotated at high speed, it appears white. It happens because at high speed of rotation the colour of a portion in a region changes very fast and we see the combination of colours.

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