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Консультация № 138438
29.05.2008, 09:40
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Доброго времени суток! Уважаемые эксперты, помогите пожалуйста решить –
Кварцевую пластинку поместили между скрещенными николями. При какой наименьшей толщине dmin кварцевой пластины поле зрения между николями будет максимально просветлено? Постоянная вращения α кварца равна 27 град/мм.
Кварцевую пластинку поместили между скрещенными николями. При какой наименьшей толщине dmin кварцевой пластины поле зрения между николями будет максимально просветлено? Постоянная вращения α кварца равна 27 град/мм.
Обсуждение
Неизвестный
29.05.2008, 12:50
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это ответ
Здравствуйте, Петров Василий Алибабаевич!
Если бы пластинки не было, свет через два скрещенных поляризатора - николя не прошел бы. Однако пластинка из оптически активного материала способна поворачивать плоскость поляризации. Чтобы свет максимально прошел через второй поляризатор, нужно повернуть плоскость поляризации на 90 градусов, чтобы новая поляризация совпала с осью второго поляризатора. Формула для поворота плоскости поляризации:
fi=a*d
где а=27град/мм, d - искомая толщина пластинки:
90=27*d -> d=90/27=3,33 мм
Если бы пластинки не было, свет через два скрещенных поляризатора - николя не прошел бы. Однако пластинка из оптически активного материала способна поворачивать плоскость поляризации. Чтобы свет максимально прошел через второй поляризатор, нужно повернуть плоскость поляризации на 90 градусов, чтобы новая поляризация совпала с осью второго поляризатора. Формула для поворота плоскости поляризации:
fi=a*d
где а=27град/мм, d - искомая толщина пластинки:
90=27*d -> d=90/27=3,33 мм
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