define power of lens
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The power of a lens is defined as the reciprocal of the focal length. ... Converging (convex ) lenses have positive focal lengths, so they also have positive power values. Diverging (concave ) lenses have negative focal lengths, so they also have negative power values.
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The power of a lens is defined as the reciprocal of the focal length . lens power is measured in dioptres (D).
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