Question

A ray of light is incident at an angle of 60 on one face of a prism of angle 30. the emergent ray of light makes an angle of 30 with incident ray. the angle made by the emergent ray with second face of prism will be

Answer 1

incidence angle on one face of a prism , i = 60°

angle of prism , A = 30°

emergent rays that makes an angle 30° with incident ray.

we know, deviation angle , $\delta$ = angle between incident ray and emergent ray = 30°

using formula, $\delta=i+e-A$

so, 30° = 60° + e - 30°

or, e = 0°

hence , angle made by emergent ray with normal to the face of plane is 0°.

hence, angle made by the emergent ray with second face of prism will be 90° .

Answer 2

Answer: 90 with second face

Explanation:

I=60

A=30

S=30

A + S =I + E

By using this

E=0

Thus , emergence Ray makes 0 degree with the normal

So it will make 90 degree with second face

Thanks

Hope this will help you