Question

a student needs a lens of power -2.0 D to correct his distant vision the focal length of the given lens is

Answer 1

d=1/f

-2=1/f

f=1/-2

f=-0.5m

Answer 2

Answer:

Focal length of the given lens (f) = - 0.5 m

Explanation:

Given that the lens has the power P = -2.0D

We know that the required formula is given by the lens formula.

f = 1/P

Here, f is measured in metre.

For correcting the distant vision, focal length of the given lens is:

f = 1/P = 1 / (-2) = - 0.5 m

Hope it helps.