The formula which gives the relation between the object distance(u), image distance(v), and the focal length(f) of a mirror is called mirror formula. It ise expressed as: 1/v+1/v=1/f

A formula which gives the relationship between image distance (v),object distance(u), and focal length(f) of a spherical mirror is known as the mirror formula .
Mirror formula can be written as:
1/f = 1/v +1/uwhere,v= distance of image from mirroru= distance of object from mirrorf= focal length of the mirror
The distance of an object from the pole of mirror is known as object distance. object distance is denoted by the letter u.
The distance of image from the pole of a mirror is known as image distance. image distance is denoted by the letter v.
The distance of focus from the pole of a mirror is known as focal length. focal length is denoted by the letter f.