The object is at a distance \( \mathrm{l}=45 \mathrm{~cm} \) from the screen. With lens we obtai...

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The object is at a distance \( \mathrm{l}=45 \mathrm{~cm} \) from the screen. With lens we obtain a small image of the object on the screen. By moving the lens, we receive a different image on the screen, whose size is
\( P \) 4 times greater than the first. What is the focal length (in \( \mathrm{cm} \) ) of the lens?
W.
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