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Reported Question / Answer
Q.) An optician prescribes a power = -0.5 dioptre. The corresponding lens must be a
1)
convex lens of focal length 2 m
2)
convex lens of focal length 50 cm
3)
concave lens of focal length 2 m
4)
concave lens of focal length 50 cm
5)
NULL
Answer :
3
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