A lens has a power of +2.0 dioptre. What can be said about it?

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1. A lens has a power of +2.0 dioptre. What can be said about it?

It is concave, with a focal length of 0.5 m

It is convex, with a focal length of 2.0 m

It is convex, with a focal length of 0.5 m

It is concave, with a focal length of 2.0 m

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Positive power always means a convex, converging lens. Focal length equals 1 divided by power in dioptres: 1 ÷ 2.0 = 0.5 m.