Changes

[[Image:lighterstill.jpg]]

[[Image:lighterstill.jpg]]

[[Image:PrismAndLight.jpg|right|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.]]

[[Image:PrismAndLight.jpg|right|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.]]

'''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]].