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

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Q: 88 (NDA-I/2013)
An optician prescribes a power = -0.5 dioptre. The corresponding lens must be a
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question_subject: 

Science

question_exam: 

NDA-I

stats: 

0,40,36,12,12,40,12

keywords: 

{'convex lens': [0, 0, 0, 4], 'concave lens': [0, 1, 6, 5], 'focal length': [1, 0, 5, 7], 'lens': [0, 0, 0, 1], 'cm': [2, 0, 7, 20]}