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Knowledge Center/ Glossary/ Index of Refraction (n)

Index of Refraction (n)

The ratio of the speed of light in a vacuum (c) to the speed of light in a refractive material (v). The index of refraction of a given medium varies with wavelength because the speed of light varies with wavelength. Common indices of refraction include n_d(the yellow helium line at 587.6nm), n_f(the blue hydrogen line at 486.1nm) and n_c (the red hydrogen line at 656.3nm).

See also Abbe-Number , Birefringence , Angle of Incidence , Glass Code , Angle of Reflection , Dispersion , Refraction , Gradient Index , Cladding

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