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.



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