Question

The far point of a myopic eye is 80cm in front of the eye . What is the nature and power of the lens required to correct the problem ?

I need the relevant answer with steps ​

Answer 1

Answer:

The person is suffering from myopia and hence need a concave lens to correct the defect. The lens should be such that an object at infinity must form its image at the far point.

Given, distance of far point x = 80 cm

To view distant objects correctly, the focal length of the corrective lens, f = -x = -80 cm

Power of the lens P (in meters) = (1/ -0.8) = -1.25D

The lens is concave of power = -1.25D

A concave lens of power – 1.25 D is required by the individual to correct his defect.