Задача 40504.

A photographic camera whose lens has a focal length F1 = 13.5 cm needs to photograph an object located at a distance d = 18 cm from the lens. The distance from the photographic plate to the lens is f = 27 cm. What should be the focal length F2 of the so-called attachment lens, which must be placed close to the lens in order for the image on the photographic plate to be sharp?

Detailed solution with a brief record of the conditions, formulas and laws used in the solution, derivation of the calculation formula and answer.
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