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Консультация № 186194
26.05.2012, 12:21
84.15 руб.
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Уважаемые эксперты! Пожалуйста, ответьте на вопрос:
На диаграмму с круглым отверстием диаметром d=4 мм падает нормально параллельный пучок лучей монохроматического света (λ=0,5 мкм). Точка наблюдения находится на оси отверстия на расстоянии b=1 м от него. Сколько зон Френеля укладывается в отверстии? Тёмное или светлое пятно получится в центре дифракционной картины, если в месте наблюдения поместить экран.
На диаграмму с круглым отверстием диаметром d=4 мм падает нормально параллельный пучок лучей монохроматического света (λ=0,5 мкм). Точка наблюдения находится на оси отверстия на расстоянии b=1 м от него. Сколько зон Френеля укладывается в отверстии? Тёмное или светлое пятно получится в центре дифракционной картины, если в месте наблюдения поместить экран.
Обсуждение
26.05.2012, 13:51
общий
это ответ
Здравствуйте, Посетитель - 373608!
Известна формула для числа
зон Френеля, которые оставляются открытыми отверстием радиусом 
расположенным на расстоянии 
от источника сферической световой волны и на расстоянии 
от точки наблюдения:
При
(пучок падающих на диафрагму лучей света параллелен) из формулы (1) получим
Следовательно, в отверстии укладывается 8 зон Френеля - чётное число. Поэтому в центре дифракционной картины получится тёмное пятно.
С уважением.
Известна формула для числа
зон Френеля, которые оставляются открытыми отверстием радиусом расположенным на расстоянии от источника сферической световой волны и на расстоянии от точки наблюдения:При
(пучок падающих на диафрагму лучей света параллелен) из формулы (1) получимСледовательно, в отверстии укладывается 8 зон Френеля - чётное число. Поэтому в центре дифракционной картины получится тёмное пятно.
С уважением.
Об авторе:
Facta loquuntur.
Facta loquuntur.
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