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# Long description

An illustration of the visible spectrum of light, showing the colours with their corresponding wavelength in nanometres (10–9 m). A coloured horizontal bar indicates the colours visible at various wavelengths. An oscillating black line below the bar illustrates that the wavelength of light increases as the spectrum progresses from violet through blue to red, but the energy of the light decreases.

If you are interested in the colours for the respective wavelength (in nanometres) shown in the horizontal bar, these are (from left to right) violet around 350; purple around 400; blue around 450; green around 500; yellow around 550; orange around 600, and red around 650.