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refractive index
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refractive index

n.

Abbr. n The ratio of the speed of light in air or in a vacuum to the speed of light in another medium.

refractive index (RI) (rē·frakˑ·tiv inˑ·deks),

n a measurement of the bending of a light ray when moving from a less dense substance to a higher dense material. Measured by a refractometer.

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