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Консультация № 189849
04.10.2016, 07:24
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Здравствуйте! Прошу помощи в следующем вопросе:
Если между двумя скрещёнными поляроидами поместить третий, оптическая ось которого составляет угол 15° с оптической осью анализатора, то поле зрения посветлеет. Во сколько раз изменится интенсивность прошедшего света от величины интенсивности естественного света? Потерями света при отражении и поглощении пренебречь.
Если между двумя скрещёнными поляроидами поместить третий, оптическая ось которого составляет угол 15° с оптической осью анализатора, то поле зрения посветлеет. Во сколько раз изменится интенсивность прошедшего света от величины интенсивности естественного света? Потерями света при отражении и поглощении пренебречь.
Обсуждение
08.10.2016, 10:34
общий
это ответ
Здравствуйте, alenchik2545!
Пусть исходная интенсивность естественного света равна I0
Естественный свет можно рассматривать как сумму световых волн равной интенсивности, поляризованных в перпендикулярных плоскостях, поэтому первый поляризатор уменьшает интенсивность света в 2 раза
I1=I0/2
При прохождении последующих поляризаторов плоскость поляризации поворачивается, а интенсивность прошедшего света пропорциональна квадрату косинуса угла между плоскостью падающего света и плоскостью поляризатора
I2=I1[$183$]cos2(90[$176$]-[$945$])=I1[$183$]sin2[$945$]
I3=I2[$183$]cos2[$945$]
Итого получаем
I3=I0[$183$]sin2[$945$][$183$]cos2[$945$]/2=I0[$183$]sin22[$945$]/8=I0[$183$]sin230[$176$]/8=I0/32
Пусть исходная интенсивность естественного света равна I0
Естественный свет можно рассматривать как сумму световых волн равной интенсивности, поляризованных в перпендикулярных плоскостях, поэтому первый поляризатор уменьшает интенсивность света в 2 раза
I1=I0/2
При прохождении последующих поляризаторов плоскость поляризации поворачивается, а интенсивность прошедшего света пропорциональна квадрату косинуса угла между плоскостью падающего света и плоскостью поляризатора
I2=I1[$183$]cos2(90[$176$]-[$945$])=I1[$183$]sin2[$945$]
I3=I2[$183$]cos2[$945$]
Итого получаем
I3=I0[$183$]sin2[$945$][$183$]cos2[$945$]/2=I0[$183$]sin22[$945$]/8=I0[$183$]sin230[$176$]/8=I0/32
11.10.2016, 07:16
общий
Адресаты:
Зачем модераторов звали?
Об авторе:
We have but faith: we cannot know;
For knowledge is of things we see;
And yet we trust it comes from thee,
A beam in darkness: let it grow.
-----
https://www.linkedin.com/in/andreynkuznetsov
https://www.researchgate.net/profile/Andrey_Kuznetsov11
http://www.researcherid.com/rid/K-8824-2014
We have but faith: we cannot know;
For knowledge is of things we see;
And yet we trust it comes from thee,
A beam in darkness: let it grow.
-----
https://www.linkedin.com/in/andreynkuznetsov
https://www.researchgate.net/profile/Andrey_Kuznetsov11
http://www.researcherid.com/rid/K-8824-2014
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