Mathematical and Physical Journal
for High Schools
Issued by the MATFUND Foundation
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# Problem P. 4345. (April 2011)

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 pont)

Deadline expired on May 10, 2011.

Sorry, the solution is available only in Hungarian. Google translation

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

### Statistics:

 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.

Problems in Physics of KöMaL, April 2011