Problem P. 4660. (October 2014)
P. 4660. What can you observe if you look through a piece of densely weaved tulle curtain, or through the fabric of an old-type (made of silk) open umbrella and watch a distant light source?
Deadline expired on November 10, 2014.
32 students sent a solution. 3 points: Fekete Panna, Tihanyi Áron, Tóth Miklós. 2 points: Brezovcsik Dániel, Hegedűs Gergő, Hornyák Szabolcs, Kis Bence, Koch Lilla, Páhoki Tamás. 1 point: 5 students. 0 point: 18 students.