Question

power of magnifying glass is given by
A) f+p B) 1 +(d/f) C) 1 - (f/d) D) 1 + fd

Answer 1

The magnifying power of a lens is based on the fact that you can normally bring an object within 25 cm of your eyes. (The “near point.”)

If you use a magnifying lens, you can effectively move the object closer so it appears larger.

The formula is

M=d/4+1

where d is the refractive power of the lens in diopters. This formula comes from the fact that diopters are 1/fl where fl is the focal length in meters. Another way to write it is:

M = 1+ 0.25 m/fl

where 0.25m is the near point.

So if you have a +4 lens, the magnifying power is 2x. If you have a lens with a 2.778 cm focal length, the power is 10x.

Answer 2

Explanation:

b,.................................