Question

What is the relation between refractive indices $\mu ,{\mu }_1$ and ${\mu }_2$ if the behaviour of light rays is as shown in figure.

• A. $\mu >{\mu }_2>{\mu }_1$
• B. $\mu <{\mu }_2<{\mu }_1$
• C. $\mu <{\mu }_2;\mu ={\mu }_1$
• D. ${\mu }_2<{\mu }_1;\mu ={\mu }_2$

Answer 1

The correct option is C $\mu <{\mu }_2;\mu ={\mu }_1$

The ray does not suffer any deviation on entering the lens. Hence ${\mu }_1=\mu$. The ray leaves the second surface of the lens bending towards the normal. Hence ${\mu }_2>\mu$. Thus the correct choice is (c).