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.
another name for refractive index
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.
noun, Machinery. 1. a plate perforated with rows of different numbers of equally spaced holes as a guide for indexing work.
- Index register
processor A register found in some CPUs, whose contents can be added to the address operand to give the effective address. Incrementing the index register then allows the program to access the next location in memory and so on, making it very useful for working with arrays or blocks of memory. Index registers first appeared […]
[in-dee-uh] /ˈɪn di ə/ noun 1. Hindi Bharat. a republic in S Asia: a union comprising 25 states and 7 union territories; formerly a British colony; gained independence Aug. 15, 1947; became a republic within the Commonwealth of Nations Jan. 26, 1950. 1,246,880 sq. mi. (3,229,419 sq. km). Capital: New Delhi. 2. a subcontinent in […]
noun 1. a sturdy, heavyweight fabric constructed in a figured weave, used especially in upholstery.