Question

A ray of light incident at an angle θ on a refracting face of prism emerges from the other face normally. If the angle of the prism is 5 and the prism is made of material of refractive index 1.5, the angle of incidence is

Answer 1

Answer:

We have deviation, δ=(M−1)A

δ=(1.5−1)5

∘

=2.5

∘

The angle of the prism is 50°.The ray emerges from refracting face of a prism normally.

Then, i

2

=r

2

=0

As, A=r

1

+r

2

=0

r

1

=A

r

1

=50°

But i

1

=μr

1

=

2

3

×5=7.5°