Apr 6, 2014
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DIOPTRE

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A term used in the measurement of the refractive or focusing power of lenses; one dioptre is the power of a lens with a focal distance of one metre and is the unit of refractive power. As a stronger lens has a greater refractive power, this means that the focal distance will be shorter. The strength in dioptres therefore is the reciprocal of the focal length expressed in metres.

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