A person cannot see distinctly objects kept beyond 2 m. This defect can be corrected by using a lens of power (a) + 0.5 D (b) – 0.5 D (c) + 0.2 D (d) – 0.2 D

Answer: (b) – 0.5 D

The person concerned has myopia and requires a concave lens to correct the problem.

The required focal length of the lens 1/f = P

P = -1/2 = 0.5D

A power of -0.5D is required to fix the myopic eye.

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