A right angled prism of refractive index ${\mu }_1$ is placed in a rectangular block of refractive index ${\mu }_2$, which is surrounded by a medium of refractive index ${\mu }_3$, as shown in the figure, A ray of light $e$ enters the rectangular block at normal incidence. Depending upon the relationships between ${\mu }_1,{\mu }_2$ and ${\mu }_3$, it takes one of the four possible paths $ef, eg, eh$ or $ei$

Match the paths in column $\mathrm{I}$ with conditions of refractive indices in column $\mathrm{II}$ and select the correct answer using the codes given below the columns.

Column- $\mathrm{I}$	Column- $\mathrm{I}$
$\mathrm{P}.$ $e\to f$	$1.$ ${\mu }_1>\sqrt{2}{\mu }_2$
$\mathrm{Q}.$ $e\to g$	$2.$ ${\mu }_2>{\mu }_1$ and ${\mu }_2>{\mu }_3$
$\mathrm{R}.$ $e\to h$	$3.$ ${\mu }_1={\mu }_2$
$\mathrm{S}.$ $e\to i$	$4.$ ${\mu }_2<{\mu }_1<\sqrt{2}{\mu }_2$ and ${\mu }_2>{\mu }_3$