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<\/figure><\/div><\/div><\/div><\/div><\/div>\n\n\n\nIl m’a lui-m\u00eame expliqu\u00e9 que le miroir grossissant donnait une image plus grosse mais moins bonne parce qu’il y avait la m\u00eame quantit\u00e9 de lumi\u00e8re sur une plus grosse surface.<\/p>\n\n\n\n
Il jouant avec le prisme et m’a demand\u00e9 comment faire un arc-en-ciel. Je lui en ai montr\u00e9 un sur la porte et il a alors fix\u00e9 le prisme et plac\u00e9 un miroir o\u00f9 se trouvait l’arc-en-ciel pour voir ce qu’il pourrait obtenir de diff\u00e9rent. Il a \u00e9t\u00e9 \u00e9merveill\u00e9 de voir appara\u00eetre une sorte d’\u0153uf color\u00e9.<\/p>\n\n\n\n
A l’\u00e9cole, une telle exp\u00e9rience ne sera jamais aussi spontan\u00e9e. Est-il possible cependant de provoquer un tel enthousiasme? Il est important de laisser les enfants exp\u00e9rimenter sans r\u00e9pondre trop vite \u00e0 leurs questions. Au lieu de r\u00e9pondre tout de suite, on sugg\u00e8re comment trouver un d\u00e9but de r\u00e9ponse tout seul. On peut leur proposer de tenter de faire un arc-en-ciel sur le mur. Une autre exp\u00e9rience o\u00f9 l’on mesure la longueur de l’ombre d’un objet vertical pourrait permettre de calculer l’angle d’incidence des rayons du soleil. De l\u00e0, on en conclurait l’angle d’incidence des rayons du soleil sur le prisme. Peuvent-ils s’imaginer la trajectoire de la lumi\u00e8re du soleil jusqu’\u00e0 l’image de l’arc-en-ciel? Plein d’exp\u00e9riences int\u00e9ressantes en perspective!<\/p>\n","protected":false},"excerpt":{"rendered":"
C’est pratiquement d\u00e9cid\u00e9, l’ann\u00e9e prochaine j’enseigne la physique et les math\u00e9matiques aux \u00e9l\u00e8ves des grandes classes. Alors, je m’int\u00e9resse particuli\u00e8rement aux jeux de Nicolas qui sont souvent des exp\u00e9riences, permettant de d\u00e9couvrir en jouant, les lois de la physique. Promis, ce n’est pas moi qui lui ai donn\u00e9 l’id\u00e9e! J’ai juste laisser tra\u00eener un prisme. 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