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/rəfrˈæktɪv ˈɪndɛks/ Listen $Listen 'refractive index'$

Refractive index

noun

The ratio of the velocity of light in a vacuum to that in a medium. Synonym: index of refraction.

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"Refractive index" Quotes from Famous Books

... large halo, more rarely seen, of angular radius 22 deg..35, is due to another cause again, and is a prismatic effect, although it exhibits hardly any colour. The angle 22-1/2 deg. is characteristic of refraction in crystals with angles of 60 deg. and refractive index about the same as water; in other words this halo is caused by ice crystals in the higher ...

— Pioneers of Science • Oliver Lodge