Problem: The familiar phenomenon of a rainbow results from the diffraction of sunlight through raindrops.Does the wavelength of light increase or decrease as we proceed outward from the innermost band of the rainbow?

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The familiar phenomenon of a rainbow results from the diffraction of sunlight through raindrops.

Photograph of a rainbow.  From outside to inside, the colors go from red to orange to yellow to green to blue to violet.

Does the wavelength of light increase or decrease as we proceed outward from the innermost band of the rainbow?