Convex Mirror is a curved mirror where the reflective surface bulges out towards the light source. This bulging-out surface reflects light outwards and is not used to focus light.
The incident rays coming parallel to the principal axis after reflection appear to diverge from a common point on the principal axis, this point is called the principal focus of a convex mirror. It is usually denoted by F.
The reflected rays do not actually pass through focus, so the focus of the convex mirror is virtual which lies behind the mirror.
