Two convex lenses of focal length 20cm each are placed coaxially with a separation of
Channel: Doubtnut
Date: 26/07/2020

Two convex lenses of focal length 20cm each are placed coaxially with a separation of 60cm between them. Find the image of a distant object formed by the combination by:  a. Using thin lense formul separately for the two lenses, and  b. Using the equivalent lens. Note that although the combination forms a real image of a distant object on the other side, it is equivalent to a diverging lens as far as the location of the final image is concerned.