Problem P. 4680. (November 2014)
P. 4680. A bi-concave air lens is made from two watch glasses of radius \(\displaystyle f=10~\)cm and a short piece of tube. Where should it be placed in a 90 cm-long aquarium, filled with water of refractive index \(\displaystyle n=1.33\), such that the image of the figure at the opaque side of the aquarium is formed exactly at the opposite wall of the aquarium?
Deadline expired on December 10, 2014.
35 students sent a solution. 4 points: Bekes Nándor, Berta Dénes, Bugár 123 Dávid, Büki Máté, Fehér Balázs, Fekete Panna, Gróf Tamás, Kasza Bence, Öreg Botond, Radnai Bálint, Szász Norbert Csaba, Tóth Ádám Bars, Tóth Miklós, Trócsányi Péter, Vankó Miléna, Varga-Umbrich Eszter, Wiandt Péter, Zöllner András. 3 points: Molnár 128 Szilárd, Páhoki Tamás, Pázmán Előd, Stein Ármin, Szilágyi Kristóf, Tanner Martin. 2 points: 5 students. 1 point: 3 students. 0 point: 3 students.