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Light trap - Lycée Żmichowska (Varsovie) Lycée Vicat (Souillac)

Titre du sujet: 
Light trap
Établissement:
Année:
Sujet jumelé ?: 
Oui
Etablissement(s) jumelé(s):
Résumé: 
Consider a plane figure f made of two sides AB and BC of a triangle and a ray of light sliding into f. Determine a concrete example of points A, B, C and a ray of light , so that we obtain 4, 5, 6, … n reflections. Is it possible, that the ray never comes out, that is to say, the number of reflections is infinite? ─ That would mean that our simple figure f is really a light trap... If you manage to solve these problems, we may think similar problems for slightly more complex traps ...
Nombre d'élèves : 
5


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Sujet | by Dr. Radut