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Light travels in waves. The light's wavelength determines its perceived color. Short wavelength light, for example, appears blue, and long wavelength light appears red. Sunlight is composed of light of many wavelengths. In the range that we can see, this includes the colors of the rainbow. When light enters water it bends (refracts). The amount of bending depends on the wavelength of light. As a result, the light splits into its component colors.
the water / fog in the air reflects the sunlight, causing the white light of the sun to divide and become a rainbow color in the sky

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13y ago

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