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为什么天空会chu现虹?

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为什么天空会chu现虹?

夏天常常下雷雨或阵雨,这些雨的范围不大,往往是这边天空在下雨,那边天空仍闪耀着qiang烈的yang光。有时候,雨过以后,天空还飘浮着许多小水滴,这些小水滴能偏折日光。当yang光经过水滴时,不仅改变了前进的方向,同时被分解成红、橙、黄、绿、青、蓝、紫七se光,如果角度适宜,就成了我们所看到的虹。空气中的水滴越大,虹越鲜艳;水滴越小,如像雾滴那样大时,虹se越淡,形成白虹。冬天不大会chu现虹,是因为天气较冷,空气干燥,下雨机会少,阵雨就更少,多数是降雪,而降雪是不会形成虹的。但在极少的情况下,天空中ju有形成虹的恰当条件时,也有可能chu现虹。

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