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[[Image:lighterstill.jpg]]

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

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

 

'''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]].

Three primary properties of light are:

Three primary properties of light are:

* [[Frequency]] or wavelength and;

* [[Frequency]] or wavelength and;

* [[Polarization]] or direction of wave oscillation.

* [[Polarization]] or direction of wave oscillation.

Light can exhibit properties of both [[wave]]s and [[Particle physics|particles]].  This property is referred to as [[wave-particle duality]].  The study of light, known as [[optics]], is an important research area in modern [[physics]].

Light can exhibit properties of both [[wave]]s and [[Particle physics|particles]].  This property is referred to as [[wave-particle duality]].  The study of light, known as [[optics]], is an important research area in modern [[physics]].