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Question

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
  1. 45
  2. 30
  3. 39
  4. 20

A
30
B
45
C
39
D
20
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+ieA=34(60+60)60=30o.

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