They are red, orange, yellow, green, blue, indigo, and violet, in descending order of frequency. They are arranged in reverse order by wavelength because of the inverse relationship. Violet is the hue that occurs most frequently.
The wavelength of visible light affects its color. These wavelengths span the spectrum, from 700 nm at the red end to 400 nm at the violet.
VISIBLE LIGHT WAVELENGTHS When the entire visible light spectrum passes through a prism, the wavelengths divide into the rainbow's hues because each color has a unique wavelength.
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