Question

A light ray is incident normally on the surface AB of a prism of refracting angle${60}^{\circ }$. If the light ray does not emerge from AC, then find the refractive index of the prism.

Answer 1

Angle of emergence $=0$

$\frac{\sin i}{\sin r}\Rightarrow \frac{{90}^{\circ }=i}{{90}^{\circ }=r}=\mu$

$\frac{\sin {90}^{\circ }}{\sin {90}^{\circ }}=\mu$

$\mu =1$