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Консультация № 189049
31.03.2016, 10:41
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Уважаемые эксперты! Пожалуйста, ответьте на вопрос:
Тонкая линза создаёт изображение S1 точечного источника S (рис. 9-вложение).АА1 – главная оптическая ось линзы. Построением (с помощью циркуля и линейки без делений) восстановите положение фокусов линзы.
Тонкая линза создаёт изображение S1 точечного источника S (рис. 9-вложение).АА1 – главная оптическая ось линзы. Построением (с помощью циркуля и линейки без делений) восстановите положение фокусов линзы.
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Обсуждение
31.03.2016, 21:19
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это ответ
Здравствуйте, anton74551!
Луч из источника, идущий через центр линзы, не отклоняется - он пройдёт по прямой через источник, его изображение и центр линзы. Проведя луч через S и S1, найдём центр линзы O, как точку пересечения его с главной осью. Центральная плоскость линзы перпендикулярна главной оси и проходит через центр.
Ещё один луч из источника проведём параллельно главной оси (и найдём его точку падения на линзу). Преломившись, он пройдёт через изображение и фокус линзы (в случае мнимого изображения в рассеивающей линзе через эти точки проходит не сам преломлённый луч, а его продолжение в обратном направлении). То есть, из точки падения параллельного главной оси луча на линзу проводим продолжение преломлённого луча через S1 и находим фокус F как точку пересечения его с главной осью.
Второй фокус, очевидно, находится по другую сторону линзы на том же расстоянии.
Луч из источника, идущий через центр линзы, не отклоняется - он пройдёт по прямой через источник, его изображение и центр линзы. Проведя луч через S и S1, найдём центр линзы O, как точку пересечения его с главной осью. Центральная плоскость линзы перпендикулярна главной оси и проходит через центр.
Ещё один луч из источника проведём параллельно главной оси (и найдём его точку падения на линзу). Преломившись, он пройдёт через изображение и фокус линзы (в случае мнимого изображения в рассеивающей линзе через эти точки проходит не сам преломлённый луч, а его продолжение в обратном направлении). То есть, из точки падения параллельного главной оси луча на линзу проводим продолжение преломлённого луча через S1 и находим фокус F как точку пересечения его с главной осью.
Второй фокус, очевидно, находится по другую сторону линзы на том же расстоянии.
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