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διόπτρα: Difference between revisions
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|mdlsjtxt=δι-όπτρα, ἡ, <i>n</i> [[ὄψομαι]], fut. of [[ὁράω]]<br />an [[instrument]] for measuring heights, a [[Jacob]]'s [[staff]], Polyb. | |mdlsjtxt=δι-όπτρα, ἡ, <i>n</i> [[ὄψομαι]], fut. of [[ὁράω]]<br />an [[instrument]] for measuring heights, a [[Jacob]]'s [[staff]], Polyb. | ||
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A dioptre (British spelling) or diopter (American spelling) is a unit of measurement of the optical power of a lens or curved mirror, which is equal to the reciprocal of the focal length measured in metres. (1 dioptre = 1 m−1.) It is thus a unit of reciprocal length. For example, a 3-dioptre lens brings parallel rays of light to focus at 1⁄3 metre. A flat window has an optical power of zero dioptres, and does not cause light to converge or diverge. Dioptres are also sometimes used for other reciprocals of distance, particularly radii of curvature and the vergence of optical beams. | |wketx=A dioptre (British spelling) or diopter (American spelling) is a unit of measurement of the optical power of a lens or curved mirror, which is equal to the reciprocal of the focal length measured in metres. (1 dioptre = 1 m−1.) It is thus a unit of reciprocal length. For example, a 3-dioptre lens brings parallel rays of light to focus at 1⁄3 metre. A flat window has an optical power of zero dioptres, and does not cause light to converge or diverge. Dioptres are also sometimes used for other reciprocals of distance, particularly radii of curvature and the vergence of optical beams. | ||
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|trtx=ar: ديوبتر; bg: диоптър; bn: ডাইঅপ্টার; ca: diòptria; cs: dioptrie; da: dioptri; de: Dioptrie; en: dioptre; eo: dioptrio; es: dioptría; et: dioptria; fa: دیوپتر; fi: dioptria; fr: dioptrie; ga: diaptar; gl: dioptría; he: דיופטר; hi: डायोप्टर; hr: dioptrija; hu: dioptria; hy: դիօպտրիա; id: dioptri; it: diottria; ja: ディオプトリ; kk: диоптр; ko: 디옵터; ky: диоптрия; lt: dioptrija; lv: dioptrija; mk: диоптер; ml: ഡയോപ്റ്റർ; mn: диоптр; ms: diopter; nl: dioptrie; nn: dioptri; no: dioptri; pa: ਡਾਇਪਟਰ; pl: dioptria; pt: dioptria; ro: dioptrie; ru: диоптрия; sl: dioptrija; sr: диоптрија; sv: dioptri; ta: டையாப்ட்டர்; te: డయాప్టర్; th: ไดออปเตอร์; tr: diyoptri; uk: діоптрія; uz: dioptriya; vi: dioptre; zh: 屈光度 | |trtx=ar: ديوبتر; bg: диоптър; bn: ডাইঅপ্টার; ca: diòptria; cs: dioptrie; da: dioptri; de: Dioptrie; en: dioptre; eo: dioptrio; es: dioptría; et: dioptria; fa: دیوپتر; fi: dioptria; fr: dioptrie; ga: diaptar; gl: dioptría; he: דיופטר; hi: डायोप्टर; hr: dioptrija; hu: dioptria; hy: դիօպտրիա; id: dioptri; it: diottria; ja: ディオプトリ; kk: диоптр; ko: 디옵터; ky: диоптрия; lt: dioptrija; lv: dioptrija; mk: диоптер; ml: ഡയോപ്റ്റർ; mn: диоптр; ms: diopter; nl: dioptrie; nn: dioptri; no: dioptri; pa: ਡਾਇਪਟਰ; pl: dioptria; pt: dioptria; ro: dioptrie; ru: диоптрия; sl: dioptrija; sr: диоптрија; sv: dioptri; ta: டையாப்ட்டர்; te: డయాప్టర్; th: ไดออปเตอร์; tr: diyoptri; uk: діоптрія; uz: dioptriya; vi: dioptre; zh: 屈光度 | ||
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