Mathematical and Physical Journal
for High Schools
Issued by the MATFUND Foundation
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# Problem P. 4567. (October 2013)

P. 4567. There is a well-illuminated goldfish at rest in an aquarium, which has thin walls, 12 cm away from the wall. With the help of a lens, which has a power of 10 dioptres, an enlarged image is to be formed on a screen. The image should be five times as big as the fish. Where should the lens and the screen be placed? (The refractive index of water is 1.33.)

(4 pont)

Deadline expired on November 11, 2013.

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

Megoldásvázlat. A lencsét az akvárium falától 3 cm-re, az ernyőt pedig az akváriumtól 63 cm-re helyezzük el!

### Statistics:

 30 students sent a solution. 4 points: Antalicz Balázs, Béda Ármin, Berta Dénes, Büki Máté, Farkas Tamás, Fehér Zsombor, Holczer András, Kovács Péter Tamás, Molnár 128 Szilárd, Sági Olivér, Sal Kristóf, Seress Dániel, Subicz Mátyás, Szász Norbert Csaba, Székely Bálint. 3 points: Dolecsek 888 Gellért, Huszár Emese, Várda Ernák. 2 points: 5 students. 1 point: 7 students.

Problems in Physics of KöMaL, October 2013