For normal incidence on a plane mirror surface, what are the values of the angle of incidence and angle of reflection?
The angle between the reflector and the light rays is 90° , when the light rays is incident conventionally on a plane mirror surface.
This indicates that the angle of incidence between the incident light rays and the normal is 0o.
Because the angle of incidence is 0 degrees, the angle of reflection is also 0o. (Due to the law of light reflection).