Question

In what DO unit is power of lenses rated?a convex lens has a focal length of 50cm calculate its power?

Answer 1

Unit the power of lenses is rated in 'Dioptre'

Focal length of the convex lens = 50 cm = 0.5 m

Power of lens = 1/focal length (in metres)

= 1/0.5 = 2 dioptre

Thus, the power of lens of focal length 50 cm is 2 Dioptre.

Hope it helps!!