Light is incident at $30^{\circ}$ on one side of a right angled isosceles prism of $\mu =\large\frac{3}{2}$. What will be the angle of emergence.

Question

$(a)\;60^{\circ} \\ (b)\;45^{\circ} \\ (c)\;no\;emergence\;takes\;place \\ (d)\;the \;light\; retraces \; its\;path$