2004/10/24 | 彩虹[Rainbow]
类别(¤〖天文〗) | 评论(0) | 阅读(27) | 发表于 17:08
The primary rainbow is caused by a single reflection from raindrops. It will be highest at 42° above the shadow of your head. The secondary rainbow has the colors reversed and is caused by a double reflection from raindrops. It will be highest at 52° above the shadow of your head.
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