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Question

Which of the following colour of light undergoes the least deviation while passing through a glass prism ?
blue
red
green
yellow

A

blue

B

green

C

red

D

yellow

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Solution

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The light which have more wavelength will scatter less and will have less dispersion.
When white light undergoes dispersion from prism then red colour will deviate least and violet deviate most.

Thus , Option A is correct.

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