Problem P. 4763. (October 2015)
P. 4763. A light-ray entering into a glass cube through one of the faces of the cube is reflected from three faces of the cube. The common point of these three faces is one of the vertices of the cube. Then the reflected light-ray emerges from the same face of the cube as it entered into it.
What can be stated about the direction of the emerging light-ray?
Deadline expired on November 10, 2015.
32 students sent a solution. 4 points: Balogh Menyhért, Csenger Géza, Horváth Botond István, Kovács Péter Tamás, Körmöczi Dávid, Nagy Kartal, Szépfalvi Bálint, Tóth Adrián. 3 points: Bekes Nándor, Debreczeni Tibor, Fehér 169 Szilveszter, Izsóf Ottó, Kádár 012 István, Mány Bence, Nemes Balázs Boldizsár, Pivoda Tamás, Simon Dániel Gábor, Tar Viktor, Tóth Bence, Török Zsombor Áron. 2 points: 1 student. 1 point: 4 students. 0 point: 5 students. Unfair, not evaluated: 2 solutions.