A convex lens of focal length 20cm and another plano convex lens of focal length 40cm
Channel: Doubtnut
Date: 26/07/2020

A convex lens of focal length 20cm and another plano convex lens of focal length 40cm are placed co-axially . The plano convex lens is silvered on plane surface. What should be the distance (in cm) so that final image of the object 'O' is formed on O itself.  img src="https://d10lpgp6xz60nq.cloudfront.net/physics_images/BMS_V04_C01_E01_313_Q01.png" width="80%"