a1call Here's your changing refractive index over the spectrum graph. pete

see:http://upload.wikimedia.org/wikipedi...sion-curve.png

oddly enough, my teaching observation this year was on refraction...the principal had never understood rainbows, and was quite pleased

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A third rate theory forbids.
A second rate theory explains after the fact.
A first rate theory predicts.
A. Lomonosov