Question

A ray of light is reflected by two plane mirror mutually at right angles to each to other. What is the deviation of reflected ray from the incident ray

• A. $90$
• B. $60$
• C. $180$
• D. $0$

Answer 1

Answer: (C)

$180$

When the light reflected by two mirrors is kept mutually right angle to each other then it gets reflected in the same direction having ${180}^{\circ }$ minimum deviation between the reflected ray and incident ray.