path-length difference
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Optical path length — In optics, optical path length (OPL) or optical distance is the product of the geometric length of the path light follows through the system, and the index of refraction of the medium through which it propagates. A difference in optical path… … Wikipedia
Coherence length — In physics, coherence length is the propagation distance from a coherent source to a point where an electromagnetic wave (or wave packet, wave function, etc.) maintains a specified degree of coherence. The significance is that interference will… … Wikipedia
Path integral formulation — This article is about a formulation of quantum mechanics. For integrals along a path, also known as line or contour integrals, see line integral. The path integral formulation of quantum mechanics is a description of quantum theory which… … Wikipedia
Path (topology) — The points traced by a path from A to B in R². However, different paths can trace the same set of points. In mathematics, a path in a topological space X is a continuous map f from the unit interval I = [0,1] to X f : I → X. The initial… … Wikipedia
Sun path — refers to the apparent significant seasonal and hourly positional changes of the sun (and length of daylight) as the Earth rotates, and orbits around the sun. To effectively gather solar energy, a solar collector (glass, solar panel, etc.) should … Wikipedia
Proper length — In relativistic physics, proper length is an invariant quantity which is the rod distance between spacelike events in a frame of reference in which the events are simultaneous. (Unlike classical mechanics, simultaneity is relative in relativity.… … Wikipedia
Open Shortest Path First — (OSPF) is an adaptive routing protocol for Internet Protocol (IP) networks. It uses a link state routing algorithm and falls into the group of interior routing protocols, operating within a single autonomous system (AS). It is defined as OSPF… … Wikipedia
List of rivers by length — This is a list of the longest rivers on Earth. It includes river systems over 1,000 kilometers. Definition of length The length of a river is actually very hard to calculate. It depends on the identification of the source, the identification of… … Wikipedia
Diffraction — Computer generated intensity pattern formed on a screen by diffraction from a square aperture … Wikipedia
spectroscopy — spectroscopist /spek tros keuh pist/, n. /spek tros keuh pee, spek treuh skoh pee/, n. the science that deals with the use of the spectroscope and with spectrum analysis. [1865 70; SPECTRO + SCOPY] * * * Branch of analysis devoted to identifying… … Universalium
Diffraction formalism — Main article: Diffraction Contents 1 Quantitative description and analysis 1.1 General diffraction 1.2 Approximations 1.3 … Wikipedia
