30.06 - Détermination des coefficients de Cauchy

30.06 - Détermination des coefficients de Cauchy

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Page 1 Christian MAIRE EduKlub S.A. Tous droits de l’auteur des oeuvres réservés. Sauf autorisation, la reproduction ainsi que toute utilisation des oeuvres autre que la consultation individuelle et privée sont interdites. Physique OPTIQUE ONDULATOIRE EXERCICE D’ ORAL -EXERCICE 30.6- ENONCE : « Détermination des coefficients de Cauchy » On considère le dispositif des fentes d’Young, supposées infiniment fines : les 2 fentes ( 1 F ) et ( 2 F ) sont distantes de 1 a mm = , l’écran d’observation étant placé à 1 D m = de ces dernières. Dans un premier temps, la source est ponctuelle et monochromatique ( 0,589 m λ µ = ) ; devant la fente ( 1 F ) la plus haute, on place une lame à faces parallèles non absorbante d’épaisseur 50 e m µ = et d’indice ( ) n λ (on admettra que la lame est attaquée sous incidence quasi-normale). On constate une translation du système d’interférences de 1 29,8 x mm = . Dans un deuxième temps, on conserve la lame mais on remplace la source monochromatique
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