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On trace l'axe optique. On place l'objet AB. On dessine la lentille convergente L1. On trace le rayon parallèle au rayon issu de B et passant par O1. Il ressort non dévié et il coupe le plan focal en B1. On place A1 à l'intersection de l'axe optique et du plan focal. Puis on dessine le rayon passant par B1 et par O2, qui ressort non dévié et le rayon arrivant perpendiculairement à la lentille et ressortant par le plan focal imagé de la deuxième lentille. Normalement les deux derniers rayons sont parallèles
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