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bn:00004125n
Noun Concept
Categories: Geometrical optics, Angle, Optics stubs
EN
angle of incidence  incidence angle  glancing angle  grazing angle  illumination angle
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The angle that a line makes with a line perpendicular to the surface at the point of incidence WordNet 3.0
English:
optics
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The angle that a line makes with a line perpendicular to the surface at the point of incidence WordNet 3.0 & Open English WordNet
The angle of incidence, in geometric optics, is the angle between a ray incident on a surface and the line perpendicular to the surface at the point of incidence, called the normal. Wikipedia
Describing the approach of a ray to a surface Wikipedia Disambiguation
The angle that a straight line, ray of light, etc., meeting a surface, makes with a normal to the surface at the point of meeting. Wiktionary
Angle that a straight line makes with the normal of a surface. Wiktionary (translation)