Why are rainbows curved?

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Graham Dilks

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Why are rainbows curved?
« on: 14/12/2010 09:30:03 »
Graham Dilks  asked the Naked Scientists:
   
I saw a programme about Sir Isaac Newton and his study on light, which made me wonder why rainbows are curved?

What do you think?
« Last Edit: 14/12/2010 09:30:03 by _system »