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Absolute refractive index
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So far we have used air as one of the media through which the light travels. Because air has a refractive index close to that of a vacuum, the refractive index of a material relative to air is a good approximation to the absolute refractive index of the material.

Usually only the absolute refractive index of a material is given in data books.

Material

Absolute refractive index

Flint glass 1.650
Diamond 2.417
Ruby 1.760
Pyrex® 1.470
Water 1.330
Air 1.0008
Ice 1.310
 

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