A bright idea - Lycée Arago (Perpignan) Colegiul National B.P. Hasdeu (Buzau, Roumanie)

Titre du sujet
A bright idea
Établissement
Lycée Arago (Perpignan)
Année
2017-2018
Etablissement(s) jumelé(s)
Colegiul National B.P. Hasdeu (Buzau, Roumanie)
Résumé
The walls of a room are all mirrors. A ray of light is sent parallel to the floor from a given point in the room. Which possible trajectories of the light can we observe depending on the original direction and the shape of the room?