Question

A ray of light falls normally on an equilateral prism and emerges out in a grazing manner. Angle of incidence at first surface of the prism is:

Answer 1

ANSWER

The ray incident normally on the first surface of the prism do not suffer refraction and falls on the second surface.

from the triangle ABC

90+60+x=180

x=30

Angle of incidence on the net surface is =(90−30)=60

0

Applying snells law on the next surface of the prism

μ×sini=1×sinr

μ×sin60

0

=1×sin90

0

μ×

2

3

=1

μ=

3

2

Hence,

option (D) is correct answer.

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