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Q.

Which of the following colour of white light is least deviated by the prism


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a

Red

b

Blue

c

Violet

d

Black   

answer is A.

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Detailed Solution

Red colour has the longest wavelength among VIBGYOR. So, the red colour has the maximum speed in a glass prism. Thus, the refractive index property for red will be minimum. When white light passes through a prism, red undergoes the least deviation and hence appears at the top of the spectrum. On the other hand, violet undergoes the maximum deviation and hence appears at the bottom of the spectrum. Hence, choice 1 is the correct answer.
 
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