Question

the focal length of a convex mirror is 10cm what is the maximum distance of image to be possible​

Answer 1

10 cm.

Behind the mirror.

As even the light rays coming from infinity appears to arise from principal focus.

Therefore, 10 cm (focal length) will be the answer.

Answer 2

$\large \tt \green {answer}$

Image is only formed between the focus and mirror in a convex mirror. The focal length of the convex mirror is given by f=R2 where R is the radius of curvature of the convex mirror. Hence the maximum distance will be 10cm. Hence the answer to our question is option (B) 10cm.