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Консультация № 191137
12.06.2017, 21:20
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Здравствуйте! Прошу помощи в следующем вопросе:
Стрелка AB перпендикулярна главной оптической оси тонкой собирающей линзы. Расстояние от стрелки до экрана, на котором полу- чилось её чёткое изображение, равно L 81 см. Если линзу передви- нуть вдоль её главной оптической оси на расстояние l 9 см, то изоб- ражение вновь окажется чётким. Каково фокусное расстояние линзы?
Стрелка AB перпендикулярна главной оптической оси тонкой собирающей линзы. Расстояние от стрелки до экрана, на котором полу- чилось её чёткое изображение, равно L 81 см. Если линзу передви- нуть вдоль её главной оптической оси на расстояние l 9 см, то изоб- ражение вновь окажется чётким. Каково фокусное расстояние линзы?
Обсуждение
16.06.2017, 11:51
общий
это ответ
Здравствуйте, komprantshow!
В первом положении (Л) линза расположена ближе к стрелке, а во втором (Л1) ближе к экрану. Вследствие сопряжённости расстояния
от линзы до стрелки и расстояния 
от линзы до изображения отрезок длиной 
расположен симметрично относительно оси, проходящей перпендикулярно отрезку длиной 
через его середину. При этом
откуда
(см), 
(см).
Тогда по формуле линзы
(см-1),
см - фокусное расстояние линзы.
В первом положении (Л) линза расположена ближе к стрелке, а во втором (Л1) ближе к экрану. Вследствие сопряжённости расстояния
от линзы до стрелки и расстояния от линзы до изображения отрезок длиной расположен симметрично относительно оси, проходящей перпендикулярно отрезку длиной через его середину. При этомоткуда
(см), (см).Тогда по формуле линзы
(см-1), см - фокусное расстояние линзы.
Об авторе:
Facta loquuntur.
Facta loquuntur.
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