A ray of light is incident on an equilateral prism in such a way that the angle of incidence is equal to the angle of emergence and each is equal to 3/4 of the prism angle. The angle of deviation for the ray of light is
A
45∘
B
30∘
C
39∘
D
20∘
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Solution
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As angle of incidence is equal to the angle of emergence the prism is set in minimum deviation position
δmin=ii+ie−A=34(60+60)−60=30o.
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