Published by:
CGP EDU Academic Team
Published on: August 13, 2026
A prism of angle 
and refractive index 
is coated with thin film of refractive index 1.5 only at the back exit surface. To have total internal reflection at the back exit surface the incident angle must be 
. ( 
and 
)
A
between 
and 
and
B
C
< 
D
Text Solution
Verified by ExpertsThe correct answer is:
C
For TIR at back surface
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