Two lenses kept together form image of an object placed at a distance of 15cm from lenses at a distance of 80cm.. If focal length of one lens is 20cm., what is the focal length of other lens?
1 Answer
Mar 2, 2017
Focal length of the lens
Explanation:
When we use two lenses of focal length
As the object is at a distance of
but
and hence
i.e.