Question

An object is placed at a distance of 10cm from a concave mirror of focal length 20cm. Draw a ray diagram to show the image formation? Calculate the image distance

Answer 1

Given , object distance u= -10 cm.

and focal length f= -20 cm

find image distance V=?

so, by mirror formula ..

1/u+1/V= 1/f

-1/10+1/V=-1/20

1/V= 1/10-1/20=20-10/200=10/200=1/20

now V= 20 cm

hope it help you

the image will be formed at behind the mirror