A narrow laser beam is directed perpendicularly towards a vertical plane mirror fixed…
PHYSICS · Single correct · CBSE · Physics · Light — Reflection and Refraction · Light — Reflection and Refraction
Problem
A narrow laser beam is directed perpendicularly towards a vertical plane mirror fixed on a wall. Which statement correctly describes the behaviour of the beam after it reaches the mirror?
(a) It is reflected back at 90∘ to the incoming direction.
(b) It continues straight through the mirror without reflection because the light strikes it normally.
(c) It retraces its original path back along the incoming direction.
(d) It spreads into a wider beam after reflection but travels along the same direction.