Question

The far point of a myopic person is 40 cm in front of the eye. What is the

nature and power of the lens required to correct the problem?​

Answer 1

Answer:

-40 cm, -2.5 D

Explanation:

Focal length of lens to be used must be equal to distance of far point.

So f=−40cm

(As myopic person needs concave lens so f negative)

power of lens, p=

f in meter

1

==−

0.40

1

=−2.5D