A ray of light is incident normally on a plane mirror. What will be the
(a) angle of incidence?
(b) angle of reflection?
(a) The angle of incidence is 0o because the incident ray is parallel to the normal.
(b) The angle of reflection is 0o in accordance with the first law of reflection, which states that the angle of incidence is equal to the angle of reflection.
Lakhmir Physics 2013