Question

What is the focal length of 2.30 D reading glasses found on the rack in a drugstore?

Answer 1

Focal length, f = 0.43 meters

Step-by-step explanation:

It is given that,

Power of the reading glasses, P = 2.3 D

We need to calculate the focal length of the reading glasses. The relationship between the power and the focal length inverse i.e.

`P=(1)/(f)`

`f=(1)/(P)`

`f=(1)/(2.3\ D)`

f = 0.43 m

So, the focal length of the reading glasses found on the rack in a drugstore is 0.43 meters.