Optics Question 517
Question: A plane mirror reflecting a ray of incident light is rotated through an angle $ \theta $ about an axis through the point of incidence in the plane of the mirror perpendicular to the plane of incidence, then
[NCERT 1978; CPMT 1991]
Options:
A) The reflected ray does not rotate
B) The reflected ray rotates through an angle $ \theta $
C) The reflected ray rotates through an angle $ 2\theta $
D) The incident ray is fixed
Show Answer
Answer:
Correct Answer: C
Solution:
By keeping the incident ray is fixed, if plane mirror rotates through an angle q reflected ray rotates through an angle 2q.
