Q. A ray of light is incident on a plane mirror at an angle of $60{^\circ}.$The angle of deviation produced by the mirror is
A) $120{^\circ}$
B) $30{^\circ}$
C) $60{^\circ}$
D) $90{^\circ}$
Explanation
(c) Here, angle of incidence, $i\ = \ 60{^\circ}$
$\therefore$ Angle of deviation
$\delta\ = \ 180{^\circ} - (i + r)$
$\ \ \ \ \ = \ 180{^\circ}\ - \ 2i\ \ (As\ i\ = \ r)$
$\ \ \ \ \ = \ 180{^\circ}\ - \ 2\ \times \ 60{^\circ}\ = \ 60{^\circ}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.