index of refraction

noun phrase

Examples of index of refraction in a Sentence

Recent Examples on the Web Similarly, a time mirror is formed by an abrupt change in the index of refraction—but in time. IEEE Spectrum, 30 Aug. 2023

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'index of refraction.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History

First Known Use

1829, in the meaning defined above

Time Traveler
The first known use of index of refraction was in 1829

Dictionary Entries Near index of refraction

Cite this Entry

“Index of refraction.” Dictionary, Merriam-Webster, Accessed 26 May. 2024.

Kids Definition

index of refraction


Medical Definition

index of refraction

: the ratio of the speed of radiation (as light) in one medium (as a vacuum) to that in another medium

called also refractive index

More from Merriam-Webster on index of refraction

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!