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Schema.lumiere.fenetre.. En supposant par exemple un trou carr dans un mur abcdabcda'b'c'd' Mais si nous avons en un mur loign de la baie de plus de vingt fois la diagonale du carr la projection des rayons solaires percemur sera dj fort altre si ce mur est une distance de cent fois la longueur de la diagonale du trou carr il n'y