Question

A doctor has prescribed a corrective lens of power +2D find the focal length of lens.​

Answer 1

Answer:

here p = +2D

F= 1/P = 1 / +2 = 0.5cm

Explanation:

beause the focal length is positive there prescribed lens is converging

I hope it will helpful

Answer 2

Given,

The power of the given lens = +2D

To find,

The focal length of the given lens.

Solution,

We can easily solve this mathematical problem by using the mathematical relationship between the power of the lens and the focal length of the lens.

The mathematical relationship is as follows -

Power of the lens = 1/Focal length of the lens

2 = 1/Focal length

1/Focal length = 2

Focal length = 0.5 metres

(Unit of the focal length should be written in metres.)

Hence, the focal length of the given lens is 0.5 metre.