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Консультация № 197761
12.02.2020, 22:23
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Уважаемые эксперты! Пожалуйста, ответьте на вопрос:
Определить фокусное расстояние F линзы, если для получения изображения предмета в натуральную величину его поместили на расстояние d=24 см от линзы.
Определить фокусное расстояние F линзы, если для получения изображения предмета в натуральную величину его поместили на расстояние d=24 см от линзы.
Обсуждение
13.02.2020, 07:50
общий
это ответ
Здравствуйте, svrvsvrv!
Изображение получено в натуральную величину, то линейное увеличение линзы = единице.
Линейное увеличение: G=f/d=1, следовательно, f=d=24 см.
Согласно формулы тонкой линзы - все величины берутся со знаком плюс, т.к. по условию получается, что линза собирающая, а предмет и изображение действительные, получаем:
1/F = 1/d + 1/f;
1/F = 2∙1/d;
1/F = 2/d;
F=d/2.
Ответ: F=0,12 м.
Изображение получено в натуральную величину, то линейное увеличение линзы = единице.
Линейное увеличение: G=f/d=1, следовательно, f=d=24 см.
Согласно формулы тонкой линзы - все величины берутся со знаком плюс, т.к. по условию получается, что линза собирающая, а предмет и изображение действительные, получаем:
1/F = 1/d + 1/f;
1/F = 2∙1/d;
1/F = 2/d;
F=d/2.
Ответ: F=0,12 м.
Форма ответа
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