The refractive index of the material of a prism is 
and its refracting angle is 
. One of the refraction surfaces of the prism is made a mirror inwards. A beam of monochromatic light entering the prism from the other face will retrace its path after reflection from the mirrored surface if its angle of incidence on the prism is
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
A
According to the given condition, the beam of light will retrace its path after reflection from BC. So
Thus, angle of refraction at surface AC
By Snell's law
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