Предмет: Физика, автор: ALIkrg

Дерево сфотографировано с расстояния 10 м. Если диаметр ствола дерева равен 25 см и ширина его изображения на фотопленке 2 мм, то оптическая сила объектива фотоаппарата равна

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Автор ответа: MashaPutnaj

Дерево сфотографировано с расстояния d==10 м. Если диаметр ствола дерева равен H=25 см и ширина его изображения на фотопленке h=2 мм, то оптическая сила объектива фотоаппарата равна D - ?

D = 1/d +1/f

d/f= H/h
1/f=H/d*h
D=1/d+H/d*h=0,1 + 0,25/10*0,002=12,6 дптр

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