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[[File:Refraction photo.png|thumb|A [[ray (optics)|ray]] of light being [[refraction|refracted]] through a glass slab|alt=refer to caption]]
In [[optics]], the '''refractive index''' (or '''refraction index''') of an [[optical medium]] is a [[dimensionless number]] that gives the indication of the [[light]]
[[File:Refraction at interface.svg|thumb|170px|Refraction of a light ray|alt=Illustration of the incidence and refraction angles]]
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