Question

A doctor has prescribed corrective lens of power +1.5D, find the focal length of the lens. Is the prescribed lens is diverging or converging?​

Answer 1

Answer:

0.67 and its converging lens.

Explanation:

Given

P = +1.5 D

Find out

We need to find out the focal length of the given lens

Solution

We know that

f = 1/P

Where,

f is the focal length

P is power

f = 1/P

= 1/+1.5 = 0.67 m.

As the power of the lens is (+ve), the lens is converging.