Question

In the figure below, PQRS denotes the path followed by a ray of light as it travels through three media in succession. The absolute refractive indices of the media are ${\mu }_1,{\mu }_{2}and{\mu }_3$ respectively. (The line segment $R{S}^1$, in the figure is parallel to PQ). Then

• A. ${\mu }_1,>{\mu }_2>{\mu }_3$
• B. ${\mu }_1,<{\mu }_2<{\mu }_3$
• C. ${\mu }_1={\mu }_3<{\mu }_2$
• D. ${\mu }_1<{\mu }_2<{\mu }_3$

Answer 1

The correct option is C ${\mu }_1={\mu }_3<{\mu }_2$

From figure we can analyse
${\mu }_2>{\mu }_1$
${\mu }_3={\mu }_1$
${\mu }_3<{\mu }_2$
$\therefore {\mu }_1={\mu }_3<{\mu }_2$