Task id17308

Task id17308

Using a camera with a lens whose optical power is 7.7 diopters, the landscape is photographed. The camera is focused on objects at a distance of 12 m. It is necessary that objects located closer or further 3 m be clearly enough - their blur on the negative should not exceed 0.2 mm. What diameter should the lens be stopped down to? What will its aperture be?

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