An optician prescribes a power = minus 0.5 dioptre. The corresponding – McqOptions

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1.	An optician prescribes a power = minus 0.5 dioptre. The corresponding lens must be a
A.	convex lens of focal length 2 m
B.	convex lens of focal length 50 cm
C.	concave lens of focal length 2m
D.	concave lens of focal length 50 cm
Answer» D. concave lens of focal length 50 cm

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