Angle of a prism is 30° and its refractive index is 2 and one of the surface is silvered. At what angle of incidence, a ray should be incident on one surface so that after reflection from the silvered surface. it retraces its path?

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30°

60°

45°

sin-11.5

answer is C.

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Detailed Solution

A=r+0⇒r=30oFrom Snell's law at surface ABμ=sin isin i⇒2=sin isin30o⇒i=45o

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