Assume that a light ray is refracted, then reflected, und then again refracted on a spherical drop of water, ccording to the figure.
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The primary rainbow is seen in the direction corresponding to the most dense clustering of rays leaving the drop after a single internal reflection. Subsequently, higher number of rainbowsfor k internal reflections,k=2,3,4,5..... Only primary and secondary are seen in nature.
The total deviation between the incident and emergent rays after k internal
reflections. Since each such reflection causes a deviation of ; (r = r(i) being the angle of
refraction, itself a function of i, the angle of incidence) and two refractions always occur, the total deviation is:
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