The far point of a myopia eye is 60 cm. Find the focal length of the lens used to correct it.

Explanation

Given, far point = v = -60 cm = -0.6 cm, Object distance `= u = -oo`.
Using lens formula , `(1)/(v)-(1)/(u) = (1)/(f) = (1)/((-0.6)) = (1)/(f)`
So, focal length = f = -0.6 m = -60 cm.