Physics - Geometrical Optics Question with Solution | TestHub

Curve is for the same prism as Q.37, so $A=60^{\circ }$

When incidence is $i_1$, $e=40^{\circ }$ (reversibility of ray)

Also $\delta =70^{\circ }$

$70^{\circ }=i_1+40^{\circ }-60^{\circ }$

$i_1=90^{\circ }$