Question

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

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

Answer 1

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

From the given figure we can analyse ${\mu }_2>{\mu }_1;{\mu }_3<{\mu }_2;{\mu }_1<{\mu }_3$
so, ${\mu }_1<{\mu }_3<{\mu }_2$