There is a prism with refractive index equal to 
and the refractive angle equal to 
One of the refractive surface of the prism is polished. A beam of monochromatic light will be retrace its path if its angle of incidence over the refracting surface of the prism is
A
B
C
D
.
Text Solution
Verified by ExpertsThe correct answer is:
C
:
The ray will retrace the path when the refracted ray 
is incident normally on the polished surface 
. Thus angle of refraction 
or 
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