Question

if focal length of one lens is -40 cm and oother +20 cm what will be the focal length​

Answer 1

Finding Power of the lens whose focal length is

20 cm : 1/f = 1/(20/100) = 1/0.2 = 5 D

hope it's help u ‼️✌️✌️

Answer 2

PLEASE MARK IT As A BRAINLIEST AND FOLLOW ME

Answer:

Finding Power of the lens whose focal length is + 20 cm : 1/f = 1/(20/100) = 1/0.2 = 5 D