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Hi Paul,
Um, no, the rainbows (a la Pink Floyd album cover) are caused by the white light being split up into its components by the refraction of the light into its different frequencies or wavelengths not its different speeds.
The light may be "bent" by the refractive index of the medium, but this just means the light wave is "bounced" of something like a snooker ball on the side of the table, which means it takes LONGER to get there, because it went FURTHER, but the SPEED of the wave didnt change on the way.
ie, The time taken for green light and red light takes the same amount of time to reach your eye. It isnt slower because its a different colour just the number of humps in the wave is different.
Chris
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