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Why do the rainbow colors appear in that order?

Sunlight is consisting of multiple wavelengths of light. It includes wavelengths of light which is not visible to us, such as infrared and ultraviolet light, as well as the visible spectrum. Reflection, refraction and dispersion of sunlight inside water droplets in the atmosphere, causes the formation of rainbow which appears as a spectrum of light in the sky. Rainbow appears as a circular arc with various colors and it always seen in the section of sky which is directly opposite the sun. A rainbow is not a physical object and it cannot be approached. It does not exist at one