The peculiarities of a reflecting surface in a spherical mirror are:
- The reflecting surface of a spherical mirror is curved.
- All incident rays from a given point on the object are reflected in such a way that they appear to originate from a single point on the other side of the mirror, called the focus.
- The reflecting surface of a spherical mirror is curved in such a way that the ratio between the distance of an object from the mirror and the distance of its image from the mirror is always constant. This ratio is known as the focal length of the mirror.
- The reflecting surface of a spherical mirror can be concave or convex, depending on the curvature of the surface.