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Binjour, serait - il possible de m'expliquer pourquoi ces items sont faux ?

 

--> quand la lumière passe d'un milieu d'indice de réfraction faible à un milieu d'indice élevé, il existe un angle au - delà duquel il n'y a pas de réfraction

 

--> le foyer image de l’œil presbyte se situe toujours en arrière de la rétine

 

merci d'avance 🦷

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