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incidence (n.)

early 15c., "incidental matter," from Old French incidence (15c.), from Late Latin incidentia, from incidere "to happen, befall" (see incident (n.)). Meaning "act of coming into contact with or affecting" is from 1650s. In physics, of rays of light, etc., considered with reference to direction, from 1620s.

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Definitions of incidence

incidence (n.)
the relative frequency of occurrence of something;
Synonyms: relative incidence
incidence (n.)
the striking of a light beam on a surface;
he measured the angle of incidence of the reflected light
From wordnet.princeton.edu