Question

A and B are two parallel sided transparent slabs of refractive indices n$_1 $and n$_2$ respectively. A ray is incident at an angle $\theta$ on the surface of separation of A and B, and after refraction from B into air grazes the surface of B. Then

• A. $sin \theta =\frac{1}{n^{2}}$
• B. $sin \theta =\frac{1}{n_{1}}$
• C. $sin \theta =\frac{n_{2}}{n_{1}}$
• D. $sin \theta =\frac{n_{1}}{n_{2}}$

Answer 1

Answer: (B)

From snell’s law
$n_{1} sin \theta =1$
$ sin \theta =\frac{1}{n_{1}}$