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n1 sen(Ф1) = n2 sen(Ф2)
El subíndice 1 se refiere al medio desde donde incide el rayo luminoso)
n1 = 3/4; n2 = 1 (aire)
sen(Ф2 = 4/3 . sen(30°) = 0,667
Por lo tanto Ф2 = 41,8°
Saludos Herminio