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



The person is suffering from myopia .

Myopia can be corrected by using a concave lens

Since, 2m is the last point of vision, let us assume the focal length of the lens to be 2m. 

P=1/f = -½= -0.5D


So, the correct answer is (b)

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CA Maninder Singh is a Chartered Accountant for the past 14 years and a teacher from the past 18 years. He teaches Science, Economics, Accounting and English at Teachoo