Line of incidence


Line of incidence
Incidence In"ci*dence, n. [Cf. F. incidence.] [1913 Webster] 1. A falling on or upon; an incident; an event; an occurrence. [Obs.] --Bp. Hall. [1913 Webster]

2. (Physics) The direction in which a body, or a ray of light or heat, falls on any surface. [1913 Webster]

In equal incidences there is a considerable inequality of refractions. --Sir I. Newton. [1913 Webster]

3. The rate or ratio at which something occurs; as, the incidence of murder in Los Angeles; the incidence of cancer in men over 50. [PJC]

{Angle of incidence}, the angle which a ray of light, or the line of incidence of a body, falling on any surface, makes with a perpendicular to that surface; also formerly, the complement of this angle.

{Line of incidence}, the line in the direction of which a surface is struck by a body, ray of light, and the like. [1913 Webster]


The Collaborative International Dictionary of English. 2000.

Look at other dictionaries:

  • line of incidence — direction of contact …   English contemporary dictionary

  • Incidence — In ci*dence, n. [Cf. F. incidence.] [1913 Webster] 1. A falling on or upon; an incident; an event; an occurrence. [Obs.] Bp. Hall. [1913 Webster] 2. (Physics) The direction in which a body, or a ray of light or heat, falls on any surface. [1913… …   The Collaborative International Dictionary of English

  • incidence — [in′sə dəns] n. [ME (North) < OFr < LL incidentia] 1. the act, fact, or manner of falling upon or influencing 2. the degree or range of occurrence or effect; extent of influence 3. Informal an individual or particular occurrence or… …   English World dictionary

  • incidence — ► NOUN 1) the occurrence, rate, or frequency of a disease, crime, or other undesirable thing. 2) Physics the intersection of a line or ray with a surface …   English terms dictionary

  • Incidence (geometry) — In geometry, the relations of incidence are those such as lies on between points and lines (as in point P lies on line L ), and intersects (as in line L1 intersects line L2 , in three dimensional space). That is, they are the binary relations… …   Wikipedia

  • Incidence matrix — In mathematics, an incidence matrix is a matrix that shows the relationship between two classes of objects. If the first class is X and the second is Y, the matrix has one row for each element of X and one column for each element of Y. The entry… …   Wikipedia

  • Incidence structure — In combinatorial mathematics, an incidence structure is a triple :C=(P,L,I)., where P is a set of points , L is a set of lines and I subseteq P imes L is the incidence relation. The elements of I are called flags. If :(p,ell) in I,we say that… …   Wikipedia

  • Incidence algebra — In order theory, a field of mathematics, an incidence algebra is an associative algebra, defined for any locally finite partially ordered set and commutative ring with unity. Contents 1 Definition 1.1 Related concepts 2 Special elements …   Wikipedia

  • Line (geometry) — Three lines the red and blue lines have the same slope, while the red and green ones have same y intercept …   Wikipedia

  • incidence — n. 1 (often foll. by of) the fact, manner, or rate, of occurrence or action. 2 the range, scope, or extent of influence of a thing. 3 Physics the falling of a line, or of a thing moving in a line, upon a surface. 4 the act or an instance of… …   Useful english dictionary