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Консультация № 195167
07.04.2019, 21:06
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Уважаемые эксперты! Пожалуйста, ответьте на вопрос:
На каком расстоянии d от линзы с модулем оптической силы D=2 дптр нужно поместить предмет, чтобы получить изображение, уменьшенное в n=5 раз? Охарактеризовать изображение. Какую следует взять линзу? Рассмотреть все возможные случаи. Сделать рисунки.
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На каком расстоянии d от линзы с модулем оптической силы D=2 дптр нужно поместить предмет, чтобы получить изображение, уменьшенное в n=5 раз? Охарактеризовать изображение. Какую следует взять линзу? Рассмотреть все возможные случаи. Сделать рисунки.
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Обсуждение
12.04.2019, 09:33
общий
это ответ
Здравствуйте, dar777!
Изображение предмета в собирающей линзе уменьшенное, причём действительное и обратное, если предмет расположен за двойным фокусным расстоянием линзы (d>2F). Такое изображение находится с другой стороны линзы между фокусом и точкой на двойном фокусном расстоянии (F<f<2F). Это показано схематично на верхнем рисунке в прикреплённом файле.
Изображение предмета в рассеивающей линзе уменьшенное, причём мнимое и прямое; оно всегда находится с той же стороны линзы, что и предмет, но ближе к линзе. Это показано схематично на нижнем рисунке в прикреплённом файле.
В первом случае имеем f/d=1/5, f=d/5, 1/d+1/f=1/F, 1/d+5/d=2, 6/d=2, d=6/2=3 (м). Во втором случае имеем 1/d-5/d=-2, -4/d=-2, d=-4/(-2)=2 (м).
Изображение предмета в собирающей линзе уменьшенное, причём действительное и обратное, если предмет расположен за двойным фокусным расстоянием линзы (d>2F). Такое изображение находится с другой стороны линзы между фокусом и точкой на двойном фокусном расстоянии (F<f<2F). Это показано схематично на верхнем рисунке в прикреплённом файле.
Изображение предмета в рассеивающей линзе уменьшенное, причём мнимое и прямое; оно всегда находится с той же стороны линзы, что и предмет, но ближе к линзе. Это показано схематично на нижнем рисунке в прикреплённом файле.
В первом случае имеем f/d=1/5, f=d/5, 1/d+1/f=1/F, 1/d+5/d=2, 6/d=2, d=6/2=3 (м). Во втором случае имеем 1/d-5/d=-2, -4/d=-2, d=-4/(-2)=2 (м).
Прикрепленные файлы:
5
Это самое лучшее решение!
Об авторе:
Facta loquuntur.
Facta loquuntur.
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