In"ci*dence (?), n. [Cf. F. incidence.]

1.

A falling on or upon; an incident; an event.

[Obs.]

Bp. Hall.

2. Physics

The direction in which a body, or a ray of light or heat, falls on any surface.

In equal incidences there is a considerable inequality of refractions. Sir I. Newton.

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.

 

© Webster 1913.

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