Question

An object is kept on principal axis in front of convex lens of focal length 30 cm it image is form at 20 cm find the object distance and type of image formed by lens ?? I want answer with details please..​

Answer 1

Answer:

object distance is equal to -60 cm

Explanation:

mirror formula =

1/f=1/v+1/u

1/30=1/u+1/20

1/30-1/20=1/v

2-3/60=1/u

-1/60=1/u

-60=u