Published by:
CGP EDU Academic Team
Published on: September 12, 2026
A light ray is incident perpendicular to one face of a 
prism and is totally internally reflected at the glass-air interface. If the angle of reflection is 
, we conclude that the refractive index 
,
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
A
For total internal reflection from glass-air interface, critical angle 
must be less than the angle of incidence.
i.e.,
or 
But 
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