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LES FOYERS:Différents types de foyers:-Foyer _________(ou foyer réel): c'est la surface d'interaction du faisceau d'électrons et de l'anode -Foyer _________(ou foyer virtuel): -correspond à la projection géométrique du foyer thermique -il conditionne: -la charge thermique -la définition de l'________ produite par le manipulateur Utilité: -Ils conditionnent la définition de l'image et la _______ de la charge thermique ou ________ thermique -Ce sont les différentes projections sur l'anode ou à sa __________
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