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Консультация № 188136
26.10.2015, 01:27
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Уважаемые эксперты! Пожалуйста, ответьте на вопрос:
Задача по теме "Дифракция света".
Свет от точечного источника S дифрагирует на круглом отверстии. Амплитуде в точке P соответствует на векторной диаграмме вектор АC. Экран с отверстием заменяют диском того же диаметра. Найти новый вектор, соответствующий амплитуде в точке P.
Задача по теме "Дифракция света".
Свет от точечного источника S дифрагирует на круглом отверстии. Амплитуде в точке P соответствует на векторной диаграмме вектор АC. Экран с отверстием заменяют диском того же диаметра. Найти новый вектор, соответствующий амплитуде в точке P.
Обсуждение
26.10.2015, 12:45
общий
это ответ
Здравствуйте, Николай!
Начнём с того, что вектор AO является пределом амплитуды при расширении отверстия до бесконечности, то есть в отсутствие экрана. Далее отметим, что ситуация с экраном, имеющим круглое отверстие, и ситуация с диском того же диаметра в сумме дают весь волновой фронт, как при отсутствии экрана.
Отсюда следует, что сумма вектора AC и искомого вектора, соответствующего амплитуде при наличии диска, равна вектору AO. Тогда искомый вектор равен AO-AC=CO
Начнём с того, что вектор AO является пределом амплитуды при расширении отверстия до бесконечности, то есть в отсутствие экрана. Далее отметим, что ситуация с экраном, имеющим круглое отверстие, и ситуация с диском того же диаметра в сумме дают весь волновой фронт, как при отсутствии экрана.
Отсюда следует, что сумма вектора AC и искомого вектора, соответствующего амплитуде при наличии диска, равна вектору AO. Тогда искомый вектор равен AO-AC=CO
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