Electromagnetic Spectrum

Generally, light is composed of a mixture of wavelengths (see light): when these wavelengths are separated into components using for example a prism light forms a spectrum, which can be defined as the intensity of radiation as a function of wavelength or frequency.

Visible light is just a part of the electro-magnetic spectrum, ranging from the smallest visible wavelength for violet (about 35 millionths of a centimeter), to 75 millionths of a centimeter for red. Higher frequencies (corresponding to shorter wavelengths) are called ultraviolet and X rays. Lower frequencies (which are at longer wavelengths) are called infrared and radiowaves.



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