Physics - Geometrical Optics Question with Solution | TestHub

Consider the following figure:
Take angle of incidence $i$, angle of reflection $r$ and angle of refraction $r_{\mathrm{F}}=30^{\circ }$ Given from geometry: $\begin{array}{rl}& r+r_{\mathrm{F}}+90^{\circ }=180^{\circ }\\ & \Rightarrow r=90^{\circ }-r_{\mathrm{F}}\end{array}$ Since, angle of incidence is equal to the angle of reflection: $\therefore i=r=90^{\circ }-r_F=90^{\circ }-30^{\circ }=60^{\circ }$