A laser beam is directed at a stationary plane mirror
PHYSICS · Multi-part · CBSE · Physics · Light — Reflection and Refraction · Light — Reflection and Refraction
Problem
A laser beam is directed at a stationary plane mirror. The mirror is then slowly rotated about an axis in its plane while the direction of the incident beam remains fixed.
(a) The mirror is turned through 5∘. Prove that the reflected beam turns through 10∘.
(b) Before rotation, the incident beam made an angle of 35∘ with the normal. Calculate the new angle of reflection after the mirror has been rotated 5∘.
(c) Find the total angle between the original and the new reflected directions of the beam.