Lenses and Prisms
Medium
Prism Total Internal Reflection
A prism of angle 75° 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 _______.
(sin 15° = 0.25 and sin 25° = 0.43)
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 _______.(sin 15° = 0.25 and sin 25° = 0.43)
SELECT ONE OPTION