Exercice 8 Etude dun prisme

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On considère un prisme qui se situe dans l'air. • 1. Calculer l'angle au sommet en fonction de r et r'. • 2. Calculer la déviation entre les rayons incident et emergent en fonction de i, i' et A. • 3. Montrer que lorsque i varie D passe par un minimum Dm. • 4. Exprimer n en fonction de A et 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