Question

A ray through the centre of curvature hitting the spherical mirror makes an angle of ___ with the normal.

• A. ${90}^{\circ }$
• B. $0^{\circ }$
• C. ${180}^{\circ }$
• D. ${45}^{\circ }$

Answer 1

The correct option is B

$0^{\circ }$

The ray through the centre of curvature is perpendicular to the tangent at the point of contact i.e. $\angle i=0^{\circ }$. Now $\angle i=\angle r=0^{\circ }$, therefore, the reflected ray retraces the path of the incident ray. Therefore, the angle made with the normal is $0^{\circ }$.