Colors that are associated with particular wavelengths are called monochromatic colors.
Wavelength is the horizontal distance between two peaks of a wave. Light is measured by its wavelength (in nanometers). It is usually represented by the Greek symbol λ. Visible light is usually defined as having wavelengths in the range of 400 to 700 nanometers (nm), or one billionth of a meter.
Different wavelengths of light are associated with different wavelengths that activate different cells in the retina and thus appear as different colors. I can answer the question from another perspective. B. Why the red areas are red, but that's another story.
Learn more about wavelengths here:https://brainly.com/question/10728818
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