A would be the incidence ray, B would be the reflected ray, C would be the normal line, D would be the angle of incidence, and E would be the angle of reflection.
Total internal reflection
The incidence ray is the ray from the object to the mirror.
The reflected ray is the ray of light thrown back by the image of the object in a mirror
The normal line is the line that is perpendicular to both the incidence and the reflected rays.
The angle of incidence is the angle that the incidence ray makes with the normal line.
The angle of reflection is the angle that the reflected ray makes with the normal line.
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