Question

the power of lens is 2d. find the focal length of lens​

Answer 1

Given power (P) = +2D --> lens is biconvex lens focal length (f) = 1/P => f = 1/2D => F = 0.5m Or, f = 50 cm So the lens is biconvex with focal length 50 cm. Answer: Focal length f= 1/p So according to the question power is +2.0 D f= 1/2.0 = 0.5 m In centimeter ...the focal length is 50cm.

Answer 2

P=1/f

So P=2 =1/f

f=1/2=0.5m