The power of a lens of focal length +0.5 m is
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Answer: A. +2 D
P = 1/f (in metres) = 1/0.5 = +2 dioptre (a converging lens).
Tap an answer to check.
Answer: A. +2 D
P = 1/f (in metres) = 1/0.5 = +2 dioptre (a converging lens).