Rainbow

Rainbows form when sunlight enters tiny water droplets in the air and is bent, reflected, and spread into different colors. As light passes from air into water, it slows down and changes direction, a process called refraction.

Different wavelengths of light bend by different amounts, causing the colors to separate in a process known as dispersion. Each color exits the droplets at a specific angle, so only certain wavelengths from certain droplets reach your eyes.

Although rainbows appear as arcs, they are actually circular patterns centered opposite the Sun, with the ground blocking the lower portion from view.

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