UPSC NDA I 2013 General Ability Paper

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Question : 138 of 150

Marks: +1, -0

An optician prescribes a power =−0.5 dioptre. The corresponding lens must be a

convex lens of focal length 2m
convex lens of focal length 50cm
concave lens of focal length 2m
concave lens of focal length 50cm

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