题目内容：
（10分）
（1）在阳光照射下，充满雾气的瀑布上方常常会出现美丽的彩虹，彩虹是太阳光射人球形水珠经折射、内反射，再折射后形成的。光的折射发生在两种不同介质的__________上，不同的单色光在同种均匀介质中_______________不同。
参考答案：
选择题：(10分)(1)在阳光照射下,充满雾气的瀑布上方常常会出现美丽的彩虹,彩虹是太阳光射人球形水珠经
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