An object 20 cm in front of a lens forms a sharp image on a

Last updated: 6/25/2023

An object 20 cm in front of a lens forms a sharp image on a film 10 cm behind the lens A glass plate 6 cm thick of refrac tive index 1 50 is placed between lens and film with its plane faces parallel to film At what distance from lens should object be shifted to be in sharp focus on film b 22 cm a 18 cm c 15 cm d 16 cm