Index-of-refraction meaning

The ratio of the speed of light in a vacuum to the speed of light in a medium under consideration.
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The ratio of the sine of the angle of incidence to the sine of the angle of refraction for a ray of light crossing from one medium into another.
noun
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A measure of the extent to which a substance slows down light waves passing through it. The index of refraction of a substance is equal to the ratio of the velocity of light in a vacuum to its speed in that substance. Its value determines the extent to which light is refracted when entering or leaving the substance.
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See IOR.
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