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Консультация № 181412
17.12.2010, 16:40
0.00 руб.
0
4
1
Здравствуйте, уважаемые эксперты! Прошу Вас ответить на следующий вопрос:
Высота Солнца над горизонтом 20°. При помощи плоского
зеркала в пруд пускают зайчик. Под каким углом к горизонту следует
расположить зеркало, чтобы под воду луч света вошел под углом 60° к
ее поверхности? Найти два решения.
Высота Солнца над горизонтом 20°. При помощи плоского
зеркала в пруд пускают зайчик. Под каким углом к горизонту следует
расположить зеркало, чтобы под воду луч света вошел под углом 60° к
ее поверхности? Найти два решения.
Обсуждение
17.12.2010, 17:11
общий
решение
показатель преломления воды 1.33
тогда sina/sinb=1/n sinb=sina*n b=arcsin(sina*n)
b=arcsin(0.5/1.33)=42[$186$]
т.е луч должен входить в воду под углом 22[$186$]к перпендикуляру воды 68[$186$] к коризонту
1 случай
угол падения=углу отражения
альфа=(180-48+20)
уг=90-(альфа/2-20)
90-((180-48+20)/2-20)=34[$186$]к горизонту
2 случай
90-((20+48)/2-20)=76
показатель преломления воды 1.33
тогда sina/sinb=1/n sinb=sina*n b=arcsin(sina*n)
b=arcsin(0.5/1.33)=42[$186$]
т.е луч должен входить в воду под углом 22[$186$]к перпендикуляру воды 68[$186$] к коризонту
1 случай
угол падения=углу отражения
альфа=(180-48+20)
уг=90-(альфа/2-20)
90-((180-48+20)/2-20)=34[$186$]к горизонту
2 случай
90-((20+48)/2-20)=76
Об авторе:
to live is to die
to live is to die
28.12.2010, 07:51
общий
это ответ
Здравствуйте, Aptemis!
Ответ в прикреплённом файле.
Ответ в прикреплённом файле.
Прикрепленные файлы:
Неизвестный
29.12.2010, 20:57
общий
Адресаты:
Жаль, что как ответ это так и не ушло, так что благодарность лишь устная, а награда уходит более предприимчивому модератору)
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