A person suffering from the eye-defect myopia (short-sightedness) can see clearly only up to a distance of 2 metres. What is the nature and power of lens required to rectify this defect?

Question

Philoid · Accepted Answer

A person suffering from the eye-defect myopia (short-sightedness) can see clearly only up to a distance of 2 meters should must use concave lens.

Calculation of the power is given by

Here, far point of myopic eye = 2m

The object kept at infinity can be seen dearly if the image of this objects is formed at 2 m.

So, object distance,

Image distance , v = 2m

f = –2m