Question

A myopic person is using spectacles of power `-1.5 D` for distant vision. How far can he see distincltly without specs ?

Answer 1

Here, `P = -1.5 D, f = (100)/(P) cm = (100)/(-1.5) cm = -66.7 cm`
This is the focal length of concave lens used by the person for distant vision. This is the distance upto which the person can see clearly without specs.