The first recorded theory about the rainbow phenomenon was formulated by Noah, who interpreted it as a sign of God's acceptance of his offering. The rainbow can be represented mathematically in terms of Snell's law (Willebrord Snellius) and the Fresnel boundary equations.
sir isaac newton =========================== Have you ever actually LOOKED at a rainbow ? Did you see seven 'distinct' colors ? Or did you see a continuous spread of every color that the human eye can see and the brain can distinguish ?