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Консультация № 187422
02.06.2013, 17:15
87.91 руб.
0
1
1
Уважаемые эксперты! Пожалуйста, ответьте на вопрос:
Плоская волна монохроматического света падает нормально на тонкую пленку масла постоянной толщины, покрывающую стеклянную пластинку. Длина волны источника может меняться непрерывно. Полное отсутствие отраженного света наблюдается только на волнах 5000 и 7000 Å. Какова толщина масляной пленки, если показатель преломления масла 1,3, а стекла 1,5?
Плоская волна монохроматического света падает нормально на тонкую пленку масла постоянной толщины, покрывающую стеклянную пластинку. Длина волны источника может меняться непрерывно. Полное отсутствие отраженного света наблюдается только на волнах 5000 и 7000 Å. Какова толщина масляной пленки, если показатель преломления масла 1,3, а стекла 1,5?
Обсуждение
02.06.2013, 20:42
общий
это ответ
Здравствуйте, Лубошев Е.М.!
Воспользуемся известным решением следующей задачи [1, с. 333 - 334]:
Нас интересует конечная формула для толщины плёнки:
Максимальное ослабление отражённого света наблюдается при длинах волн
и 
Поэтому полагая 
получим два ряда значений толщины плёнки:
- для
- для
Понятно, что условию максимального ослабления отражённого света для обеих длин волн соответствует плёнка толщиной
Ответ: 0,673 мкм.
Литература
1. Чертов А. Г., Воробьёв А. А. Задачник по физике. - М.: Высш. шк., 1988. - 527 с.
Если будете переписывать решение задачи, имейте в виду, что в Вашем случае показатель преломления масла равен 1,3, а не 1,4 (как в процитированном примере).
С уважением.
Воспользуемся известным решением следующей задачи [1, с. 333 - 334]:
Нас интересует конечная формула для толщины плёнки:
Максимальное ослабление отражённого света наблюдается при длинах волн
и Поэтому полагая получим два ряда значений толщины плёнки:- для
- для
Понятно, что условию максимального ослабления отражённого света для обеих длин волн соответствует плёнка толщиной
Ответ: 0,673 мкм.
Литература
1. Чертов А. Г., Воробьёв А. А. Задачник по физике. - М.: Высш. шк., 1988. - 527 с.
Если будете переписывать решение задачи, имейте в виду, что в Вашем случае показатель преломления масла равен 1,3, а не 1,4 (как в процитированном примере).
С уважением.
Об авторе:
Facta loquuntur.
Facta loquuntur.
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