A rainbow is an atmospheric optical arc produced by refraction, internal reflection and wave dispersion of light in water droplets. Wavelength-dependent refractive index separates the colours. The primary arc involves one internal reflection, and the secondary arc involves two.
"Rainbow" can refer to several different concepts, depending on the context. Here are a few of the most common meanings: 1. **Natural Phenomenon**: A rainbow is a meteorological phenomenon that occurs when sunlight refracts, reflects, and disperses through water droplets in the atmosphere, resulting in a spectrum of light appearing in the sky.
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