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Re: Rainbow applet



Once again, thanks for the resource. It looks like there is a lot of
promising applets to go through.

Cliff Parker



Check this out: It is a java applet that demonstrates the correct physics
of a rainbow.
http://www.phy.ntnu.edu.tw/java/Rainbow/rainbow.html

Note (!) that you can grab the incident ray with the mouse and drag it up
and down. Watch how the 1-bounce emergent ray (#3) moves one way, pauses
at the *caustic* angle, and then moves back. This is what produces the
primary bow at the caustic angle. Ditto for the 2-bounce emergent ray
(#4), which produces the secondary bow at a slightly different angle. Also
notice the little "3" and "4" markers sliding on the angle axis of the
intensity graph.

And BTW, on the page
http://alboot.ba.infn.it/www/didattica.html
there is a pointer not only to the rainbow applet, but scads of other
things. I haven't checked them all out, but if they are as cool as this
rainbow applet this is quite at trove.

______________________________________________________________
John S. Denker jsd@monmouth.com