Wavelength for the various colors

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Approximate wavelength (in vacuum) For the various colors.

The order of colors in light, arranged from shortest wavelength to longest, is called the visible spectrum of light. The image below shows light's visible spectrum, which runs from violet to red. You might recognize the spectrum as the order of colors in a rainbow.

visible spectrum

But light waves can also have wavelengths lower or higher than the wavelengths in the visible spectrum, and many familiar types of radiation are just light waves with other wavelengths. Ultraviolet light and x-rays have wavelengths shorter than violet light, and infrared (heat) and radio waves have wavelengths longer than red light.

The full range of wavelengths for light is called the "electromagnetic spectrum." The image and table below show which wavelength ranges in the electromagnetic spectrum correspond to which types of light.

Electromagnetic Spectrum