IOM 2016, Блиц — Задача 39

Olympiad of Metropolises, Moscow. Blitz Contest, September, 5 · 5 септември 2016 г.

Условие

The answer should be given in SI-units and rounded to the nearest integer, unless otherwise is stated. $g = 10$ m/s$^2$.

A point-like object is placed on the optical axis of a thin converging lens. At which distance from the lens, in the units of its focal length, should the object be placed in order to be closest to its real image?

Решение

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Оригинал в Архива: blitz.pdf