Q: If you suddenly replaced all the water drops in a rainbow with same-sized spheres of polished diamond, what would happen to the rainbow? How do you calculate the size of a rainbow?
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If it doesn’t make plenty of sense why a rainbow is angle-dependent, why not swing by the first rainbow post? If the index of refraction of the air is N A and the index of refraction of the water is N W , then: . N W is slightly different for different colors, which is ultimately what gives rise to rainbows. The index of diffraction is different for different materials, but it also changes for different colors of light (different frequencies). One reflection gives you the standard rainbow, but two reflections gives you a second rainbow (hence: double rainbows).