If a newton's color disc composed of seven colors is rotated at high speed, it appears as

Seven coloured disc rotating

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Few colours merge and only three dominant colours are visible

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Colours mix and it appears white

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Colours mix giving a sparkling effect

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Solution

The correct option is C Colours mix and it appears white
Human eyes cannot differentiate between different colors when they move at a high speed. So, white light comprises seven colours. Hence, when a newton's colour disc composed of seven colours is rotated at a high speed, it appears as Colours mix as it appears white.

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