P. 4345. A converging lens of optical power 2 dioptre and of diameter 8 cm is stick to one end of a 30 cm long cardboard tube, and a concave lens of optical power -5 dioptre and of the same diameter is stick to the other end of the tube. The tube is held such that it points towards the Sun with the converging lens. A screen is placed first at a distance of 10 cm from the diverging lens, and then at a distance of 20 cm.

What can be seen on the screen?

(4 points)

Deadline expired.

Sorry, the solution is published in Hungarian only.

Az ernyő mindkét állása esetén tehát a Nap egyenes állású, 3,2 cm átmérő képét látjuk az ernyőn.

Statistics on problem P. 4345. 33 students sent a solution. 4 points: Béres Bertold, Bolgár Dániel, Borszuk Adrienn, Czigány Máté Gábor, Fonyó Viktória, Gróf Gábor, Győrfi 946 Mónika, Hoffmann Hanna, Horicsányi Attila, Janzer Barnabás, Jéhn Zoltán, Kacz Dániel, Kerti Dávid, Kunsági-Máté Sándor, Maknics András, Nagy Zsolt, Papp Roland, Pázmán Koppány, Schwarcz Gergő, Szabó 928 Attila, Szegedi Domonkos, Szentgyörgyi 994 Rita, Tamási Mátyás, Zsámboki Richárd. 3 points: Csathó Botond, Kollarics Sándor, Nagy Zsuzsika. 2 points: 3 students. 1 point: 2 students. Unfair, not evaluated: 1 solution.