When white light passes through water droplets, it undergoes refraction, which bends the light due to the change in medium from air to water. This bending causes the different wavelengths (colors) of light to spread out, resulting in a spectrum. This phenomenon is responsible for the formation of rainbows, as the light is refracted, reflected internally, and then refracted again as it exits the droplets, creating a circular arc of colors in the sky.
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