One of the refracting surfaces of a prism of angle 30° is silvered. A ray of light incident at angle of 60° retraces its path. The refractive index of the material of prism is
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a
2
b
3
c
3/2
d
2
answer is B.
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Detailed Solution
r2=0°r1+r2=Ar1=A=30∘ and i1=60∘μ=sini1sinr1=sin60∘sin30∘=3