An object 2 0m in front of a lens forms a sharp image on a

Last updated: 6/8/2023

An object 2 0m in front of a lens forms a sharp image on a film 10cm behind the lens A glass plate 1cm thick of refractive index 1 50 is interposed between lens and film with its plane faces parallel to film At what distance from the lens should the object shifted to be in sharp focus on film A B C D 2 0 m 6 4 m 5 6 m 3 2 m