Un rayon lumineux se propage dans un milieu \( n_1 \) d'indice de réfraction \( 1,09 \).
Il pénètre, avec un angle d'incidence de \( 72° \), dans un milieu \( n_2 \), homogène, d'épaisseur
\( 8 mm \) et d'indice de réfraction \( 2,09 \).
Il ressort de ce milieu parallèlement au rayon incident.
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Déterminer le décalage \( d \) du rayon lumineux.
On donnera la réponse avec 2 chiffres significatifs et suivie de l'unité qui convient.