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Ernest Z. Violet light has the shortest wavelength. Visible light has a wavelength range of about 400 - 700 nm. The visible colours from shortest to longest wavelength are: violet, blue, green, yellow, orange, and red.
It has colors ordered from highest to lowest frequency. where #f# is frequency and #lambda# is wavelength. Since #c#, the speed of light, remains constant, as frequency goes up, wavelength must go down. Therefore violet has the highest frequency and the shortest wavelength of the visible colors of light. And red has the lowest frequency and the longest wavelength of the visible colors of light.