回複：Please post a picture of natural 圓形彩虹.

來源: guest007 於 2010-08-10 18:32:35 [] [舊帖] [給我悄悄話] 閱讀數 : (130 bytes)
回答: 回複：你見過向上彎的彩虹嗎？ 由 guest007 於 2010-08-10 11:19:25

as 布衣之才 mentioned, if you know how it is formed, you can understand why round is also possible.

just try google images.

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