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Definisi 'dioptre'
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English to English noun
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a unit of measurement of the refractive power of a lens which is equal to the reciprocal of the focal length measured in meters; used by oculists |  | source: wordnet30
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A unit employed by oculists in numbering glasses according to the metric system; a refractive power equal to that of a glass whose principal focal distance is one meter. | | source: webster1913
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