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- Refractive_index abstract "In optics the refractive index or index of refraction n of a substance (optical medium) is a dimensionless number that describes how light, or any other radiation, propagates through that medium. It is defined as ,where c is the speed of light in vacuum and v is the speed of light in the substance. For example, the refractive index of water is 1.33, meaning that light travels 1.33 times slower in water than it does in vacuum. (See typical values for different materials here.)The refractive index determines how much light is bent, or refracted, when entering a material. This is the historically first use of refractive indices and is described by Snell's law of refraction,,where and are the angles of incidence and refraction, respectively, of a ray crossing the interface between two media with refractive indices and . The refractive indices also determine the amount of light that is reflected when reaching the interface, as well as the critical angle for total internal reflection and Brewster's angle.The refractive index can be seen as the factor by which the speed and the wavelength of the radiation are reduced with respect to their vacuum values: the speed of light in a medium is , and similarly the wavelength in that medium is , where is the wavelength of that light in vacuum. This implies that vacuum has a refractive index of 1, and that the frequency of the wave is not affected by the refractive index. The refractive index varies with the wavelength of light. This is called dispersion and causes the splitting of white light into its constituent colors in prisms and rainbows, and chromatic aberration in lenses.Light propagation in absorbing materials can be described using a complex-valued refractive index. The imaginary part then handles the attenuation, while the real part accounts for refraction.The concept of refractive index is widely used within the full electromagnetic spectrum, from x-rays to radio waves. It can also be used with wave phenomena such as sound. In this case the speed of sound is used instead of that of light and a reference medium other than vacuum must be chosen.".
- Refractive_index thumbnail Refraction_photo.png?width=300.
- Refractive_index wikiPageExternalLink RefractiveIndex.INFO.
- Refractive_index wikiPageExternalLink Documentation.asp.
- Refractive_index wikiPageExternalLink luxpop.com.
- Refractive_index wikiPageExternalLink IndexofRefraction.html.
- Refractive_index wikiPageExternalLink refractive-index-database.
- Refractive_index wikiPageExternalLink www.sopra-sa.com.
- Refractive_index wikiPageExternalLink index.html.
- Refractive_index wikiPageID "25880".
- Refractive_index wikiPageRevisionID "604955963".
- Refractive_index hasPhotoCollection Refractive_index.
- Refractive_index subject Category:Concepts_in_physics.
- Refractive_index subject Category:Dimensionless_numbers.
- Refractive_index subject Category:Glass_physics.
- Refractive_index subject Category:Optical_mineralogy.
- Refractive_index subject Category:Optics.
- Refractive_index subject Category:Physical_quantities.
- Refractive_index comment "In optics the refractive index or index of refraction n of a substance (optical medium) is a dimensionless number that describes how light, or any other radiation, propagates through that medium. It is defined as ,where c is the speed of light in vacuum and v is the speed of light in the substance. For example, the refractive index of water is 1.33, meaning that light travels 1.33 times slower in water than it does in vacuum.".
- Refractive_index label "Brechungsindex".
- Refractive_index label "Brekingsindex".
- Refractive_index label "Indice de réfraction".
- Refractive_index label "Indice di rifrazione".
- Refractive_index label "Refractive index".
- Refractive_index label "Współczynnik załamania".
- Refractive_index label "Índice de refracción".
- Refractive_index label "Índice refrativo".
- Refractive_index label "Показатель преломления".
- Refractive_index label "قرينة الانكسار".
- Refractive_index label "屈折率".
- Refractive_index label "折射率".
- Refractive_index sameAs Index_lomu.
- Refractive_index sameAs Brechungsindex.
- Refractive_index sameAs Δείκτης_διάθλασης.
- Refractive_index sameAs Índice_de_refracción.
- Refractive_index sameAs Indice_de_réfraction.
- Refractive_index sameAs Indeks_bias.
- Refractive_index sameAs Indice_di_rifrazione.
- Refractive_index sameAs 屈折率.
- Refractive_index sameAs 굴절률.
- Refractive_index sameAs Brekingsindex.
- Refractive_index sameAs Współczynnik_załamania.
- Refractive_index sameAs Índice_refrativo.
- Refractive_index sameAs m.06g9s.
- Refractive_index sameAs Q174102.
- Refractive_index sameAs Q174102.
- Refractive_index wasDerivedFrom Refractive_index?oldid=604955963.
- Refractive_index depiction Refraction_photo.png.
- Refractive_index isPrimaryTopicOf Refractive_index.
