Question

If power of lens is +2.0d then what is the focal length

Answer 1

Answer: 0.5 m

Explanation:  power = 1 / focal length

                       P = 1/f

                       2 = 1/f

                       f = 1/2

                       f = 0.5 m

Answer 2

here
power of lense is +2.0d= 2d
to find the focal length =f=?

power of lense=1/f
2=1/f
f=1/2
f=0.5

focal length is 0.5