Two vertical parallel mirrors $\mathrm{A}$ and $\mathrm{B}$ are separated by $10$ cm. $\mathrm{A}$ point object $\mathrm{O}$ is placed at a distance of $2 \mathrm{cm}$ from mirror $\mathrm{A}.$ The distance of the second nearest image behind mirror $\mathrm{A}$ from the mirror $\mathrm{A}$ is $\_\_\_\_\_\_\_ \mathrm{cm}.$