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<\/figure>\n\n\n\nPuis j\u2019ai mis en \u00e9vidence la\u00a0d\u00e9viation des rayons lumineux par une lentille convergente<\/strong>, qui les rassemble en un point focal. <\/p>\n\n\n\n J\u2019ai ensuite r\u00e9p\u00e9t\u00e9 l\u2019exp\u00e9rience avec une\u00a0lentille divergente<\/strong>, qui, \u00e0 l\u2019inverse, \u00e9carte les rayons.<\/p>\n\n\n\n Gr\u00e2ce au contenu du coffre \u2014 et \u00e0 un peu de bricolage \u2014 j\u2019ai m\u00eame pu assembler un\u00a0projecteur rudimentaire<\/strong>, <\/p>\n\n\n\n et amorcer la construction d\u2019un\u00a0microscope<\/strong>.<\/p>\n\n\n\n Au fond d’une armoire du laboratoire, j\u2019ai mis la main sur un petit tr\u00e9sor oubli\u00e9 : des \u00e9l\u00e9ments d\u2019optique aimant\u00e9s, deux plaques m\u00e9talliques \u2014 dont l\u2019une munie d\u2019une feuille gradu\u00e9e en angles \u2014 ainsi qu\u2019un vieux coffre en bois contenant une s\u00e9rie de lentilles et des supports pour les fixer. Avec ce mat\u00e9riel, j\u2019ai pu 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