Question

A person having a myopic eye uses a concave lens of focal length 50 cm. What is its nature?

Answer 1

focal length of concave lens is negative

Focal length of lens is $-50cm=-0.5m$

$P=\frac{1}{f}=\frac{1}{-0.5}=-2D$

Since the focal length of lens is negative its myopic defect .Lens is diverging in nature.