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3 replies to this topic

#1 smile4me

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Posted 22 March 2008 - 10:36 PM

what shape is the rainbow?
rainbow.jpg

really?
check this out
http://www.youtube.c...feature=related

Edited by smile4me, 22 March 2008 - 10:45 PM.

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#2 largeneal

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Posted 23 March 2008 - 04:17 AM

Hmmmm...a rainbow with no color?! Some gay jokes are coming to mind, but I don't discriminate :) Let's see - like the St. Louis Arch, it almost resembles a caternary object. I don't know, I just think I sound smart when I say "caternary." Neat video, though, and I like adding random comments, so why not to something that doesn't have a comment yet? :)
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#3 claire

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Posted 23 March 2008 - 10:19 AM

I think an ARC shape!
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#4 ADParker

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Posted 24 March 2008 - 05:50 AM

I think an ARC shape!

Nope. A circle.

All Rainbows are this shape, most are cut off by the horizon. The only reason that one in the video was seen complete was that the observer was at a sufficient hight above the groud (or any other obstacle) to see the whole thing.
The colours seen are a matter of light refraction, so where exactlythey are seen is determined not by a set point in space - That is a "Rainbow" is not at all like a solid set in place object - But by the point at which the light hits an observers eye, at just the "right" angle for them to see the colours. So the 'position' of the rainbow is a combination of the area where light is refracted by water droplets and the position of the observer. As a result two observers side by side will see two slightly different rainbows in two slightly different locations :D
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