Question

A person with a myopic eye cannot see objects beyond $1.2m$ distinctly. What should be the type of the corrective lens used to restore proper vision.

Answer 1

Given that,

The person can't see objects beyond $1.2m$ directly

So, in order to view the distances beyond $1.2m$, the focal length of the lens should be $1.2m$.

Now, the power

$P=\frac{1}{f}$

$P=\frac{1}{1.2}$

$P=0.83D$

So, the person suffers from Myopia, the corrective lens will be concave or diverging lens.

Hence, the power is $0.833D$