2. Index metrology

2.1 Refraction methods

A light ray incident on the separating surface of two media 1 and 2, with different indices n ₁ and n ₂ , undergoes a change of direction, or refraction, the value of which is determined by applying Descartes' law formula (figure 1 ):

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Index metrology

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page The refractive index of a material medium

Using refractometers

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References

(1) - BIRCH (K.J.), DOWNS (M.J.) - An updated Edlen equation for the refractive index of air. - Metrologia vol. 30, p. 155 à 162 (1993).
(2) - JOHNSEN (S.E.), SCHNELLE (P.D.) - A precision recording refractometer (Réfractomètre enregistreur de précision)....

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