absolute index of refraction


noun Optics.


Nearby words

  1. absolute glaucoma,
  2. absolute hemianopsia,
  3. absolute humidity,
  4. absolute hyperopia,
  5. absolute impediment,
  6. absolute judgment,
  7. absolute leukocytosis,
  8. absolute magnitude,
  9. absolute majority,
  10. absolute maximum

index of refraction

noun Optics.

a number indicating the speed of light in a given medium as either the ratio of the speed of light in a vacuum to that in the given medium (absolute index of refraction) or the ratio of the speed of light in a specified medium to that in the given medium (relative index of refraction). Symbol: n

Origin of index of refraction

First recorded in 1820–30

Also called index, refractive index.

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019


British Dictionary definitions for absolute index of refraction

index of refraction

noun

another name for refractive index
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Science definitions for absolute index of refraction

index of refraction

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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