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Консультация № 179484
13.07.2010, 14:46
0.00 руб.
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1
Здравствуйте,
Увеличение микроскопа k=600. Определить оптическую силу объектива, если фокусное расстояние окуляра Fок 4 см, а длина тубуса l=24 см.
Увеличение микроскопа k=600. Определить оптическую силу объектива, если фокусное расстояние окуляра Fок 4 см, а длина тубуса l=24 см.
Обсуждение
13.07.2010, 15:37
общий
это ответ
Здравствуйте, max123.
Решение:
Увеличение микроскопа k = k1*k2, где k1 – увеличение, даваемое объективом; k2 – увеличение, даваемое окуляром.
Увеличения определяются по формулам:
k1=f1/Fоб; k2=L/Fок
где f1 – расстояние от объектива до даваемого им изображения; L = 25 см – расстояние наилучшего зрения для нормального глаза.
С учетом двух последних формул, находим
k = k1*k2=f1/Fоб*L/Fок=25*f1/(Fоб*Fок)
Если принять l ≈ f1, то для определения увеличения микроскопа можно пользоваться приближенной формулой
k=25*l/(Fоб*Fок)
Отсюда:
Fоб=25*l/(k*Fок)
Подставляем численные значения:
Fоб=25*24/(600*4)=1/4=0,25см
Ответ: Fоб=0,25см
Решение:
Увеличение микроскопа k = k1*k2, где k1 – увеличение, даваемое объективом; k2 – увеличение, даваемое окуляром.
Увеличения определяются по формулам:
k1=f1/Fоб; k2=L/Fок
где f1 – расстояние от объектива до даваемого им изображения; L = 25 см – расстояние наилучшего зрения для нормального глаза.
С учетом двух последних формул, находим
k = k1*k2=f1/Fоб*L/Fок=25*f1/(Fоб*Fок)
Если принять l ≈ f1, то для определения увеличения микроскопа можно пользоваться приближенной формулой
k=25*l/(Fоб*Fок)
Отсюда:
Fоб=25*l/(k*Fок)
Подставляем численные значения:
Fоб=25*24/(600*4)=1/4=0,25см
Ответ: Fоб=0,25см
5
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