There is a great lecture on the physics of rainbows on MIT's Open Courseware: http://ocw.mit.edu/courses/physics/8-03-physics-iii-vibrations-and-waves-fall-2004

There is a great lecture on the physics of rainbows on MIT's Open Courseware: http://ocw.mit.edu/courses/physics/8-03-physics-iii-vibrations-and-waves-fall-2004/video-lectures/lecture-22/ http://ocw.mit.edu/courses/physics/8-03-physics-iii-vibratio...