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On observe un rayon réfracté dans l'eau (n eau ​ = 1,33) avec un angle de réfraction de 25°. ◆ Quel est l'angle d'incidence si le rayon incident est dans l'air (n air ​ = 1) ? Et dans l'huile (n huile ​ = 1,47) ?

Sagot :