Question

A ray of light is incident on a plane mirror at an angle of incidence of ${30}^{\circ }$. The deviation produced by the mirror is

• A. ${30}^{\circ }$
• B. ${60}^{\circ }$
• C. ${90}^{\circ }$
• D. ${120}^{\circ }$

Answer 1

The correct option is D

${120}^{\circ }$

Angle of incidence = ${30}^{\circ }$

Total deviation = ${60}^{\circ }$ + ${60}^{\circ }$ = ${120}^{\circ }$