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Q.

A ray of light passes through an equilateral glass prism in such a manner that the angle of incidence is equal to the angle of emergence and each of these angles is equal to 3/4 of the angle of the prism. The angle of deviation is

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a

45°

b

39°

c

20°

d

30°

answer is D.

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Detailed Solution

Given  i=e=34A=34×60=45oIn  the  position  of  minimum  deviation2i=A+δm   or  δm=2i−A=90−60=30o
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