A ray of light strikes a plane mirror at an angle of incidence of 35°. If the mirror is rotated through 10°, through what angle is the reflected ray rotated?
A. 70° B. 45° C. 25° D. 20°
Correct Answer: D
Explanation
When ever a ray of light is incident on a plane mirror at an angle of incidence l, if the mirror is then rotated through an angle θ, then the reflected ray is rotated through an angle twice θ So if θ = 35°, then the reflected ray is rotated through 2 x 10o = 20°
