A convex lens has a focal length of 50 cm. What is its optical power?

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1. A convex lens has a focal length of 50 cm. What is its optical power?

+2 D

+0.02 D

−0.5 D

+0.5 D

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Power equals 1 divided by focal length in metres: 1 ÷ 0.5 m = 2 D, and it’s positive since this is a converging, convex lens.