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'''Light''' is a form of [[electromagnetic radiation]] with a [[wavelength]] which can be detected by the [[human]] [[eye]].<ref>International Commission on Illumination 1987. [http://www.cie.co.at/publ/abst/17-4-89.html ''International Lighting Vocabulary'']. Number 17.4. CIE, 4th edition. {{ISBN|978-3-900734-07-7}}.<br>By the ''International Lighting Vocabulary'', the definition of ''light'' is: “Any radiation capable of causing a visual sensation directly.”</ref> It is a small part of the [[electromagnetic spectrum]]. Animals can also see light. The study of light, known as [[optics]], is an important research area in modern physics. When light hits an opaque object it forms a shadow.
Light is electromagnetic radiation that shows properties of both [[wave]]s and [[Particle physics|particles]]. Light exists in tiny energy packets called [[photons]]. Each wave has a [[wavelength]] or [[frequency]]. The human eye sees each wavelength as a different [[color]]. [[Rainbow]]s show the entire spectrum of visible light. The separate colors, moving in from the outer edges, are usually listed as [[red]], [[orange]], [[yellow]], [[green]], [[blue]], [[indigo]] and [[violet]]. Other colors can be seen only with special [[camera]]s or [[instrument]]s: Wavelengths below the frequency of red are called [[infrared]], and higher than of violet are called [[ultraviolet]].
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