Question

find focal length of a convex mirror ​

Answer 1

Explanation:

The focal length of not only convex mirror but any type of mirror van be calculated by this Mirror Equation :

$\frac{1}{v}+\frac{1}{u}=\frac{1}{f}$

where,

$v$=Image's Distance from the Mirror

$u$=Object's Distance from the Mirror

$f$=Focal Length if the Mirror

Just put the values of image distance and object distance in the equation with the right sign and compute the focal length of not only convex mirror but any mirror.