power (x)


power (x)
   1. a unit expressing the magnifying power of an optical system. The power is defined to be the angular diameter of the image formed by the system divided by the angular diameter of the original object being observed. In simple telescopes this is equal to the focal length of the primary objective (the big lens or mirror) divided by the focal length of the eyepiece lens. For binoculars, the power is customarily followed by the diameter of the objective lenses, in millimeters, so "8x40" indicates binoculars with a magnifying power of 8 and lenses of diameter 40 mm.
   2. a measure of the focal power of a lens equal to 40 times the focal length, or 40 divided by the refractive power in diopters.
   For example, a 2.00 diopter lens in a pair of reading glasses is also described as 20 power.
   3. a term indicating that a measurement is a multiple of some standard quantity.
   For example, in computer technology, a 16x CD-ROM drive spins a disk 16 times faster than a "standard" speed drive.

Dictionary of units of measurement. 2015.

Look at other dictionaries:

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  • Power — Pow er, n. [OE. pouer, poer, OF. poeir, pooir, F. pouvoir, n. & v., fr. LL. potere, for L. posse, potesse, to be able, to have power. See {Possible}, {Potent}, and cf. {Posse comitatus}.] 1. Ability to act, regarded as latent or inherent; the… …   The Collaborative International Dictionary of English

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