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An electromagnetic wave propagating along a path C has the phase shift over C as if it was propagating a path in a vacuum, length of which, is equal to the optical path length of C. Thus, if a wave is traveling through several different media, then the optical path length of each medium can be added to find the total optical path length. The ...
Optical path (OP) is the trajectory that a light ray follows as it propagates through an optical medium. The geometrical optical-path length or simply geometrical path length ( GPD ) is the length of a segment in a given OP, i.e., the Euclidean distance integrated along a ray between any two points. [ 1 ]
The principal ray or chief ray (sometimes known as the b ray) in an optical system is the meridional ray that starts at an edge of an object and passes through the center of the aperture stop. [5] [8] [7] The distance between the chief ray (or an extension of it for a virtual image) and the optical axis at an image location defines the size of ...
A slightly more rigorous definition of a light ray follows from Fermat's principle, which states that the path taken between two points by a ray of light is the path that can be traversed in the least time. [1] Geometrical optics is often simplified by making the paraxial approximation, or "small angle approximation".
By (i), the ray path is a path of stationary traversal time from P to W′; [17] and by (ii), it is a path of stationary traversal time from a point on W to P′. [ 18 ] So Huygens' construction implicitly defines a ray path as a path of stationary traversal time between successive positions of a wavefront , the time being reckoned from a point ...
This algorithm calculates the shortest path using the number of optical routers as the cost function. A single probe is used to establish the connection using the shortest path. The running time is the cost of Dijkstra's algorithm: O ( m + n log n ) {\displaystyle O(m+n\log n)} , where m {\displaystyle m} is the number of edges and n ...
When a lightpath can be established between source and destination node endpoints the connection is totally optical and avoids throttling by intermediate electronic conversions and processing. [1] Where a lightpath passes through an Optical add-drop multiplexer (OADM) is known as a cut-through lightpath .
Distance, the total distance an object travels dependent on its path through space; Optical path length, the product of the distance light travels and the refractive index of the medium it travels through; Mean free path, the average distance that a particle travels before scattering