Question

The focal length of convex mirror is 40 cm.A point source of light is kept at distance 40 cm from the mirror. Find the distance of image from the mirror.​

Answer 1

Object distance u=−40 cm

Focal length f=40 cm

Using mirror formula :

v

1

+

u

1

=

f

1

Or

v

1

+

(−40)

1

=

(40)

1

We get v=20 cm