Question 230: Ray Optics

Question

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

Accepted Answer

Given : $${i_1} = 60^\circ $$; $$A = 30^\circ $$
Then angle of deviation is given by
$$\delta  = 1 - A = 60^\circ  - 30^\circ  = 30^\circ $$
We know that,
$${i_1} + {i_2} = A + \delta  \Rightarrow 60^\circ  + {i_2} = 30^\circ  + 30^\circ  \Rightarrow {i_2} = 0$$
It means emergent ray leaves face AC normally.

Answer

0o

Answer

90o

Answer

45o

Answer

30o

Ray Optics

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

Choose the correct answer: