A narrow parallel beam of monochromatic light is incident normally on a clean plane…
PHYSICS · Multi-part · CBSE · Physics · Light — Reflection and Refraction · Light — Reflection and Refraction
Problem
A narrow parallel beam of monochromatic light is incident normally on a clean plane mirror fixed vertically on a wall.
(i) What are the numerical values of the angle of incidence i and the angle of reflection r in this situation?
(ii) Draw a neat, labelled ray diagram to show the incident ray, the normal, and the reflected ray for this case.
(iii) Using the laws of reflection, explain in words why the beam retraces its path after striking the mirror.