Define power of lens.
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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). ... 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). ... Diverging (concave ) lenses have negative focal lengths, so they also have negative power values.
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