The refractive index of the material of a prism is 
and the angle of the prism is 
. One of the two refracting surfaces of the prism is made a mirror inwards, by silver coating. A beam of monochromatic light entering the prism from the other face will retrace its path (after reflection from the silvered surface) if its angle of incidence on the prism is
A
B
C
D
zero.
Text Solution
Verified by ExpertsThe correct answer is:
B
: For retracing the path shown in figure, light ray should be incident normally on the silvered face. Applying Snell ’ s law at point M ,
i . e ., 
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