Question

Using mirror formula, explain why does a convex mirror always produce a virtual image.

Answer 1

For a convex mirror,

Focal length, f > 0
Position of object, u < 0

From mirror formula, we have

`1/f=1/v+1/u=>1/v=1/f-1/u`

`=>1/v>0`

∴v>0

This means that the image formed by a convex lens is always behind the mirror and hence, virtual.