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Консультация № 161758

01.03.2009, 21:58

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Угол полной поляризации при отражении света от кристалла каменной соли равен 57о. Определить скорость  распространения света в этом кристалле.

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02.03.2009, 03:03

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это ответ

Здравствуйте, Масленников Александр!

Угол Брюстера
Когда свет на грань падает под таким углом (f1), что между отраженным (f1) и преломленным (f2) лучами есть прямой угол
(pi-f1-f2= pi/2, отсюда f2= (pi/2)-f1)),
то отраженный луч полностью поляризован.
Показатель преломления среды
n= sin(f1)/sin(f2)= c/v

sin(f2)= sin((pi/2)-f1)= cos(f1)
n= c/v= sin(f1)/cos(f1)= tg(f1)= tg(57o)= 1.54

Ответ
скорость света в кристалле
v= c/n= 0.65*c= 195 000 000 (м/с)

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