The ray diagram of a spherical mirror consists of three rays, namely the incident ray, the reflected ray, and the normal. The incident ray is the ray of light that travels from the object to the mirror, the reflected ray is the ray of light that is reflected off the mirror, and the normal is a line drawn perpendicular to the surface of the mirror. The incident and reflected rays intersect at the focal point of the mirror, while the normal is drawn through the centre of the mirror.