index of refraction

noun phrase

Examples of index of refraction in a Sentence

Recent Examples on the Web
These examples are automatically compiled from online sources to illustrate current usage. Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.
Light travels through water at three-quarters its speed in a vacuum, making water’s index of refraction 1.33. Bysara Reardon, science.org, 5 Sep. 2024 The higher the index of refraction, the slower light travels in that medium. Rhett Allain, WIRED, 23 Aug. 2024 Similarly, a time mirror is formed by an abrupt change in the index of refraction—but in time. IEEE Spectrum, 30 Aug. 2023

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.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/index%20of%20refraction. Accessed 8 Nov. 2024.

Kids Definition

index of refraction

noun

Medical Definition

index of refraction

noun
: 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

Last Updated: - Updated example sentences
Love words? Need even more definitions?

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