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Question

For a glass prism (μ=3) the angle of minimum deviation is equal to the angle of the prism. The angle of the prism is
  1. 45
  2. 90
  3. 60
  4. 30

A
45
B
90
C
60
D
30
Solution
Verified by Toppr

Using, μ=sin(A+δm2)sinA2
According to question, δm=A
3=sinA+A2sinA2
(Given μ=3)
3=sinAsinA2=2sinA2cosA2sinA2orcosA2=32=cos30
A2=30A=60

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