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Grade 12th pass10 grade science

A person cannot see distinctly objects kept beyond 2 m. This defect can be corrected by using a lens of power [NCERT Exemplar] (a) +0.5 D (b) -0.5 D (c) +0.2 D (d) -0.2 D If a person cannot see distinctly, objects kept beyond 21 m, then he is suffering from myopia.

Profile image of Harshit Singh
5 Years agoGrade 12th pass
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1 Answer

Profile image of Pawan Prajapati
5 Years ago
(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 (using sign convention). Thus, Power, P = 1/f [where, f is focal length in metre.] = 1/-2 = -0.5D .

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