Power P of a lens is given by reciprocal of focal length f

Last updated: 6/25/2023

Power P of a lens is given by reciprocal of focal length f of the lens i e P When f is in metre P is in dioptre When a number of thin lenses of power P1 P2 P3 are hold in contact with one another the power of combination is given by algebraic sum of the powers of all the lens i e P P P P3 With the help of the following passage choose the most appropriate alternative for each of the following question Two thin lenses are in contact and the focal length of the combination is 80 cm If the focal length of one lens is 20 cm the focal length of the other would be Select an answer A B C D 26 7 cm 60 cm 80 cm 20 cm