In constructing a ray diagram for light reflecting from a plane mirror, the angle of incidence is defined as which of the following?
a) The angle between the reflected ray and a line perpendicular to the mirror at the point of contact.
b) The angle between the incident ray and a line perpendicular to the mirror at the point of contact.
c) The angle between the incident ray and the mirror surface itself.
d) The angle between the incident and reflected rays.