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A ray of light falls normally on one fac...

A ray of light falls normally on one face of a right angled prims of refracting angle A. It suffers two total internal reflections before coming out of prism parallel to incident ray as shown. Refractive index to prism material will be:

A

`(sinA)/(sin3A)`

B

`(sinA)/(cos3A)`

C

`(cosA)/(sineA)`

D

`(cosA)/(cos3A)`

Text Solution

Verified by Experts

The correct Answer is:
D
By geometry we can calculate that angle of incidence on face AC is `90-3A` and angle of refraction is `90-A`.
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