Which of the following is a correct expression of mirror formula?

\(\frac{1}{v}\) + \(\frac{1}{v}\) = \(\frac{1}{f}\)

In a spherical mirror, the distance of the object from its pole is called the object distance (u). The distance of the image from the pole of the mirror is called the image distance (v). The distance of the principal focus from the pole is called the focal length (f).

There is a relationship between these three quantities given by the mirror formula which is expressed as

\(\frac{1}{v}\) + \(\frac{1}{v}\) = \(\frac{1}{f}\)