A converging beam of light is incident on a convex mirror. The reflected light may form: 

For a convex mirror ,$\frac{1}{v}+\frac{1}{\left(+u\right)}=\frac{1}{\left(+f\right)} \Rightarrow v=\frac{uf}{u-f}and \frac{v}{u}=\frac{f}{u-f}$.

Depending upon the positron of the virtual object behind the convex mirror, image could be virtual , enlarged/diminished or real.