The power of a combination of two lenses X and Y is 5 D. If the focal length of lens X be 15 cm:
Channel: Doubtnut
Date: 26/01/2020

The power of a combination of two lenses X and Y is 5 D. If the focal length of lens X be 15 cm: a) Calculate the focal length of lens Y. b) State the nature of lens Y.