Question #b01f4

2 Answers
Nov 18, 2017

Power of a lens is defined as the ability to converge or diverge light ray.
So, Higher the focal length lower the power.
Mathematically it is defined as #P=100/f # where f is given in cm
P=100/5=20 dp

Nov 18, 2017

#"20 diopter"#

Explanation:

Power = #1/"Focal length" = 1/(5 cancel"cm" × 10^-2 "m"/cancel"cm") = "20 diopter"#