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The Editors of EncyclopÃ¦dia Britannica. Diopter, in optics, unit of magnifying power of a lens or lens system. Because the power of a lens is proportional to unity (one) divided by the focal length (see lens), the power of a lens in diopters is numerically equal to 1 m divided by the focal length in metres.
An arrangement of lenses, mirrors, or both that collects visible light, allowing direct observation or photographic recording of distant objects. A refracting telescope uses lenses to focus light to produce a magnified image.