During dispersion of white light by a prism, the red colour deviates :

most

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least

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normally

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can't say

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Solution

The correct option is B least
As seen in diagram red deviates the least.
During dispersion of white light by a prism, different colors travel with different speed hence they split in prism.Red travels the faster while violet travels slowest so Red is on top and violet is at bottom.

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