IEVref:845-04-101ID:
Language:enStatus: Obsolete
Term: refractive index (of a medium, for a monochromatic radiation of wavelength <i>λ</i> in vacuum)
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Symbol: n(λ)
Definition: ratio of the velocity of the electromagnetic waves in vacuum to the phase velocity of the waves of the monochromatic radiation in the medium

unit : 1

NOTE – For isotropic media, this index is equal to the ratio of the sines of the angles of incidence (θ1) and refraction (θ2) of a ray passing through the surface separating vacuum and medium : n(λ) = sin θ1/sin θ2.


Publication date:1987
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