Question

What do you mean by 'angle of incidence' of a ray of light on a plane mirror?

Answer 1

Angle of incidence is the angle between the incident ray and the normal to the plane mirror at the point of incidence.


$\begin{array}{l}\mathrm{In}\mathrm{the}\mathrm{figure},\mathrm{MN}\mathrm{is}\mathrm{the}\mathrm{plane}\mathrm{mirror},\mathrm{AO}\mathrm{is}\mathrm{the}\mathrm{incident}\mathrm{ray},\mathrm{}\\ \mathrm{O}\mathrm{is}\mathrm{the}\mathrm{point}\mathrm{of}\mathrm{incidence},\mathrm{OX}\mathrm{is}\mathrm{the}\mathrm{normal}\mathrm{and}\angle \mathrm{AOX}\mathrm{is}\mathrm{the}\\ \mathrm{angle}\mathrm{of}\mathrm{incidence}\mathrm{.}\end{array}$