Dou­ble rain­bow

Science Illustrated - - NATURE/ RAINBOW -

Some­times, you might ob­serve a weaker rain­bow on the out­side of the pri­mary arc. Known as a sec­ondary rain­bow, this arc is the re­sult of light hav­ing been sub­jected to ex­tra re­flec­tion in­side the wa­ter drops be­fore reach­ing our eyes. The sec­ondary rain­bow can be ob­served about 9 de­grees above the pri­mary arc (i.e. 51 de­grees from the po­si­tion of the sun). Its colour se­quence is in­verted, and its colours are not as clear as those of the pri­mary rain­bow. In rare cases, there will also be a third rain­bow, in which the colours have once again been in­verted.

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