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Question

A ray of light is incident normally on one of the faces of a prism of apex angle 30o and refractive index 2. The angle of deviation of the ray is
  1. 15o
  2. 0o
  3. 22.5o
  4. 12.5o

A
15o
B
0o
C
12.5o
D
22.5o
Solution
Verified by Toppr

Using geometry in the figure, we get incident angle at prism face AC i=30o

Snell's law at P : μ sini=1×sinr

2×sin30o=sinr r=sin1(12)=45o

Thus deviation of ray: δ=ri=45o30o=15o

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