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La lunette astronomique est un instrument utilisé en optique pour observer les objets allogènes considérés à l'infini. Elle permet de grossir la taille apparente d'un objet pour pouvoir en observer des détails invisibles à l'œil nu. Elle est constituée de deux lentilles convergentes : l'objectif du côté de l'objet et l'oculaire du côté de l'œil, et d'un tube
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