See focal length in All languages combined, or Wiktionary
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In the simple case of a single convex lens, it is the distance along the optical axis from the principal plane of the lens to the lens's focal point (where, for instance, the film would be placed in a camera). For more complex or multi-element optical systems, focal length need not correspond to any obvious measurable physical distance." ], "id": "en-focal_length-en-noun-o2PsXlId", "links": [ [ "optics", "optics" ], [ "optical", "optical" ], [ "converge", "converge" ], [ "diverge", "diverge" ], [ "optical power", "optical power" ], [ "convex", "convex" ], [ "lens", "lens" ], [ "axis", "axis" ], [ "focal point", "focal point" ] ], "raw_glosses": [ "(optics) A measure of how strongly an optical system converges or diverges light, the inverse of optical power. In the simple case of a single convex lens, it is the distance along the optical axis from the principal plane of the lens to the lens's focal point (where, for instance, the film would be placed in a camera). For more complex or multi-element optical systems, focal length need not correspond to any obvious measurable physical distance." ], "topics": [ "engineering", "natural-sciences", "optics", "physical-sciences", "physics" ], "translations": [ { "code": "cmn", "lang": "Chinese Mandarin", "roman": "jiāojù", "sense": "distance", "word": "焦距" }, { "code": "cs", "lang": "Czech", "sense": "distance", "tags": [ "feminine" ], "word": "ohnisková vzdálenost" }, { "code": "da", "lang": "Danish", "sense": "distance", "word": "brændvidde" }, { "code": "nl", "lang": "Dutch", "sense": "distance", "tags": [ "masculine" ], "word": "brandpuntsafstand" }, { "code": "fi", "lang": "Finnish", "sense": "distance", "word": "polttoväli" }, { "code": "fr", "lang": "French", "sense": "distance", "tags": [ "feminine" ], "word": "distance focale" }, { "code": "de", "lang": "German", "sense": "distance", "tags": [ "feminine" ], "word": "Brennweite" }, { "code": "el", "lang": "Greek", "roman": "estiakí apóstasi", "sense": "distance", "tags": [ "feminine" ], "word": "εστιακή απόσταση" }, { "code": "hu", "lang": "Hungarian", "sense": "distance", "word": "fókusztávolság" }, { "code": "hu", "lang": "Hungarian", "sense": "distance", "word": "gyújtótávolság" }, { "code": "id", "lang": "Indonesian", "sense": "distance", "word": "jarak pumpun" }, { "code": "id", "lang": "Indonesian", "sense": "distance", "word": "jarak fokus" }, { "code": "ga", "lang": "Irish", "sense": "distance", "tags": [ "masculine" ], "word": "fad fócasach" }, { "alt": "しょうてんきょり", "code": "ja", "lang": "Japanese", "roman": "shōten kyori", "sense": "distance", "word": "焦点距離" }, { "code": "mi", "lang": "Maori", "sense": "distance", "word": "roa o te ngahunga" }, { "code": "mi", "lang": "Maori", "sense": "distance", "word": "roa ngahunga" }, { "code": "nb", "lang": "Norwegian Bokmål", "sense": "distance", "tags": [ "feminine", "masculine" ], "word": "brennvidde" }, { "code": "nn", "lang": "Norwegian Nynorsk", "sense": "distance", "tags": [ "feminine" ], "word": "brennvidd" }, { "code": "nn", "lang": "Norwegian Nynorsk", "sense": "distance", "tags": [ "feminine" ], "word": "brennvidde" }, { "code": "pl", "lang": "Polish", "sense": "distance", "tags": [ "feminine" ], "word": "ogniskowa" }, { "code": "pt", "lang": "Portuguese", "sense": "distance", "tags": [ "feminine" ], "word": "distância focal" }, { "code": "ro", "lang": "Romanian", "sense": "distance", "tags": [ "feminine" ], "word": "distanță focală" }, { "code": "ru", "lang": "Russian", "roman": "fókusnoje rasstojánije", "sense": "distance", "tags": [ "neuter" ], "word": "фо́кусное расстоя́ние" }, { "code": "sv", "lang": "Swedish", "sense": "distance", "tags": [ "common-gender" ], "word": "brännvidd" }, { "code": "tl", "lang": "Tagalog", "sense": "distance", "word": "tingubing haba" } ], "wikipedia": [ "focal length" ] } ], "word": "focal length" }
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