Question 176: Ray Optics

Question

A ray of light is incident at an angle of 60
o
on one face of a prism of angle 30
o
. The  emergent ray of light makes an angle of 30
o
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

0
o

Answer

90
o

Answer

45
o

Answer

30
o

Ray Optics

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

Choose the correct answer: