Why does single-slit diffraction create multiple bright bands?

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primarygun
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http://www.geocities.com/thescience...ffraction.html]
Refer to this web site, please.
The brightness of the colour is proportional to its amplitude?
I can understand why the middle of the screen is the brightest, but in my mind, I think there should be only one area which is bright for a single-slit.
Is that light has many beams and able to create interference for even only a single-slit?
The diffraction of a light beam is really different from that of a water wave, isn't it?
 

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Yeah, fraction is spelled wrong, and there are too many "..."