## A doctor has prescribed a corrective lens of power +1.5 D. Find the focal length of the lens. Is the prescribed lens diverging or converging?

#### Answer

Given

Power of lens = +1.5 D

We know that,

Power of the lens = 1/Focal length

1.5 = 1/Focal Length

Focal length = 1/1.5

Focal length = 10/15

Focal length = 2/3

Focal length = +0.67 m

Since the focal length is positive, the lens is a
**
convex lens.
**

And convex lens are
**
converging lens
**

Hence, the prescribed lens is converging.