Réfraction

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vidéo sans parole montrant le phénomène de réfraction. un rayon laser vert passe de l'air (premier milieu) à la face plane d'un demi cylindre de plexiglas (second milieu). On observe les rayons réfracté et réfléchi. En procédant à des arrêts sur image il est possible de relever, grâce au goniomètre gradué en degré, les valeurs des angles i (incident), i'( réfléchi) et r (réfracté) puis d'exploiter ces valeurs pour vérifier la loi de Snell-Descartes nsini=n'sinr proportionnels et i=i' . A partir de l'indice de l'air n= 1 on peut en déduire n' celui du plexigas. On trouvera n' = 1.48 environ. Remerciements à Teddy Chapillon et Maeva Laures pour leur 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