Question

A certain person can see clearly objects lying between `20 cm and 250 cm` from his eye. What spectacles are required to enable him to see distant objects clearly ? When he is wearing these spectacles, what is his least distance of distinct vision ?

Answer 1

Correct Answer - `P = -1 D`
Distance of far point, `x = 100 cm`
To see the moon clearly, he has to use specs with lens of focal length, `f = -x = -100 cm`
`P = (100)/(f) = (100)/(-100) = -1 D`.