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
&
B
C
between 
and 
and D
Both
Text Solution
Verified by ExpertsThe correct answer is:
D
For TIR at back surface
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