Angle of a prism is 30 0 and its refractive index is 
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
A
30 0
B
60 0
C
45 0
D
Text Solution
Verified by ExpertsThe correct answer is:
C
This is the case when light ray is falling normally an second surface.
Hence by using 
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