Q. What should be the angle between two plane mirrors so that whatever be the angle of incidence, the incident ray and the reflected ray from the two mirrors be parallel to each other
A) $60{^\circ}$
B) $90{^\circ}$
C) $120{^\circ}$
D) $175{^\circ}$
Explanation
(b) Incident ray and finally reflected ray are parallel to each other means $\delta = 180{^\circ}$
From $\delta = 360 - 2\theta$
$\Rightarrow 180 = 360 - 2\theta$
$\Rightarrow \ \theta = 90{^\circ}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.