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Q.

If one face of a prism of prism angle 30° and μ=2  is silvered, the incident ray retraces its initial path, then the angle of incident is

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a

600

b

900

c

370

d

450

answer is D.

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Detailed Solution

if it is retracing its path form plane mirror then it must be falling normally r2=zero  r1 must be A=300 sin isin 300=μ =2 i= 450
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If one face of a prism of prism angle 30° and μ=2  is silvered, the incident ray retraces its initial path, then the angle of incident is