On 26 Feb 2005 17:09:07 -0800, "Tudor Hughes"
wrote:

What I meant by ray tracing was
following the path of a ray of sunlight through a raindrop while
varying the angle at which it enters. It's a bit laborious but shows
that more light is reflected at angles less than the radius of the
rainbow compared to greater than that radius. The greatest
concentration is at the radius itself which is why the rainbow is
there.

I can remember rainbows being discussed in physics at school but I've
never tried that and have forgotten the refractive index and angles.

I must do a google.

Thanks again for your comments. That picture could be a 'once in a
lifetime' event.

--
Alan White
Twenty-eight miles NW of Glasgow, overlooking Loch Goil and Loch Long in Argyll, Scotland.
Web cam, http://www.windycroft.gt-britain.co....her/kabcam.htm
Web site, http://www.alan.lesley.ukgateway.net