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Question

A prism having an apex angle of 40 and refractive index of 1.50 is located in front of a vertical plane mirror as shown.A horizontal ray of light is incident on the prism. The total angle through which the ray is deviated is:
76954.jpg
  1. 40 clockwise
  2. 20 clockwise
  3. 1780 clockwise
  4. 80 clockwise

A
20 clockwise
B
1780 clockwise
C
80 clockwise
D
40 clockwise
Solution
Verified by Toppr

We have the deviation of prism,
δ1=A(μ1)=4o(1.51)
δ1=2o
For a plane mirror, i=2o
δ2=1802(2o)=176o
δ=δ1+δ2=176o+2o=178o
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