{"id":1434,"date":"2014-12-17T10:15:09","date_gmt":"2014-12-17T10:15:09","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=1434"},"modified":"2014-12-23T07:30:00","modified_gmt":"2014-12-23T07:30:00","slug":"les-couleurs-de-larc-en-ciel","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/12\/17\/les-couleurs-de-larc-en-ciel\/","title":{"rendered":"Les couleurs de l’arc-en-ciel"},"content":{"rendered":"

Le c\u00e9l\u00e8bre Isaac Newton avait choisi arbitrairement de d\u00e9couper l’arc-en-ciel<\/a> en sept couleurs : rouge, orange, jaune, vert, bleu, indigo et violet (de l’ext\u00e9rieur vers l’int\u00e9rieur).<\/p>\n

\"arc\"<\/a><\/p>\n

En r\u00e9alit\u00e9 un arc-en-ciel est un d\u00e9grad\u00e9 d’une infinit\u00e9 de couleurs, mais d’o\u00f9 proviennent-elles ?<\/p>\n

Si votre regard se porte en direction d’eau en suspension dans l’air (sous forme de pluie, de brouillard ou de gouttelettes dans le cas d’une cascade) et que le Soleil <\/a>se situe dans votre dos, vous aurez de grandes chances d’observer un arc-en-ciel. Il se formera suite \u00e0 la r\u00e9fraction et \u00e0 la d\u00e9composition des rayons lumineux apr\u00e8s leur passage \u00e0 travers des gouttes d’eau qui sont autant de prismes. En Europe une tradition veut que l’on trouve un chaudron rempli d’or au pied de l’arc-en-ciel.<\/p>\n

L’arc-en-ciel est le plus fr\u00e9quent des photom\u00e9t\u00e9ores ; halo<\/a>, nuages iris\u00e9s<\/a> et arc circumz\u00e9nithal<\/a> sont d’autres photom\u00e9t\u00e9ores qui se produisent pour les m\u00eames raisons mais sont plus rares.<\/p>\n","protected":false},"excerpt":{"rendered":"

Le c\u00e9l\u00e8bre Isaac Newton avait choisi arbitrairement de d\u00e9couper l’arc-en-ciel en sept couleurs : rouge, orange, jaune, vert, bleu, indigo et violet (de l’ext\u00e9rieur vers l’int\u00e9rieur). En r\u00e9alit\u00e9 un arc-en-ciel est un d\u00e9grad\u00e9 d’une infinit\u00e9 de couleurs, mais d’o\u00f9 proviennent-elles ?<\/p>\n","protected":false},"author":8,"featured_media":1435,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[85],"tags":[531,262,416,694,263,695,696,530,520,244,127,97],"class_list":["post-1434","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-meteores","tag-arc-circumzenithal","tag-arc-en-ciel","tag-brouillard","tag-chaudron","tag-couleur","tag-halo","tag-isaac-newton","tag-nuage-irise","tag-photometeore","tag-pluie","tag-refraction","tag-soleil"],"yoast_head":"\nCouleurs de l'arc-en-ciel<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/12\/17\/les-couleurs-de-larc-en-ciel\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Couleurs de l'arc-en-ciel\" \/>\n<meta property=\"og:description\" content=\"Le c\u00e9l\u00e8bre Isaac Newton avait choisi arbitrairement de d\u00e9couper l’arc-en-ciel en sept couleurs : rouge, orange, jaune, vert, bleu, indigo et violet (de l’ext\u00e9rieur vers l’int\u00e9rieur). 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