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[[Image:lighterstill.jpg]]
[[Image:lighterstill.jpg]]
[[Image:PrismAndLight.jpg|thumb|300px|A beam of white light (entering upwards from the right) is dispersed into its constituent colors by its passage through a [[triangular prism (optics)|prism]]. The fainter beam of white light exiting to the upper right has been reflected (without dispersion) off the first surface of the prism.]]
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'''Light''', or '''visible light''', is [[electromagnetic radiation]] of a [[wavelength]] that is visible to the human [[eye]] (about 400–700 [[nanometre|nm]]). In a [[Science|scientific]] context, the word ''light'' is sometimes used to refer to the entire [[electromagnetic spectrum]].[http://www.lightsources.org/cms/?pid=1000166] (What Is a Light Source?) Light is composed of an [[elementary particle]] called a [[photon]].
'''Light''', or '''visible light''', is [[electromagnetic radiation]] of a [[wavelength]] that is visible to the human [[eye]] (about 400–700 [[nanometre|nm]]). In a [[Science|scientific]] context, the word ''light'' is sometimes used to refer to the entire [[electromagnetic spectrum]].[http://www.lightsources.org/cms/?pid=1000166] (What Is a Light Source?) Light is composed of an [[elementary particle]] called a [[photon]].
