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  • 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

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

Answers (1)

Ans. (b)
As the person has the eye defect, myopia, therefore, a concave lens has to be used whose focal length will be, f = -2 m.
Thus,
Power
P = 1/f
P = 1/-2
P = -0.5 D
Therefore option (B) is correct

Posted by

infoexpert26

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