Question

A person cannot see distinctly objects kept beyond 2 m. This defect can be corrected by using a lens of power:

Options

• + 0.5 D

• – 0.5 D

• + 0.2 D

• – 0.2 D

Answer 1

– 0.5 D

Explanation:

A person cannot see distant objects clearly. So he is suffering from myopia. The defect is corrected by using the concave lens of power.

P = `1/"f" = 1/(-2  "m")` = – 0.5