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Question 4 (9 points) On envoie un faisceau de lumiere blanche provenant du Soleil sur un reseau de diffraction. On observe sur un ecran, le

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Question 4 (9 points) On envoie un faisceau de lumiere blanche provenant du Soleil sur un reseau de diffraction. On observe sur un ecran, le premier ordre d'une raie violette (400 nm). L'angle qui separe le maximum central et cette raie violette est de 10 . a) Quelle est la couleur du maximum central observe sur l'ecran ? (1 point) b) Determiner le nombre de fentes par mm de ce reseau. (3 points) c) Determiner a partir de quel ordre les spectres formes par la lumiere blanche (400 nm - 700 nm) se chevauchent. (5 points)

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