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