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angle of incidence

The definition of an angle of incidence is an angle made by a light ray or wave hitting a surface and the line perpendicular to that surface.

(noun)

An example of an angle of incidence is the angle between a light hitting a table and a line perpendicular to the table.

See angle of incidence in Webster's New World College Dictionary

the angle that a light ray or electromagnetic wave striking a surface makes with a line perpendicular to the reflecting surface
Chiefly Brit. angle of attack
Aeron. a permanent angle between the chord of an airfoil and the horizontally level fuselage

See angle of incidence in American Heritage Dictionary 4

noun

The angle formed by a ray incident on a surface and a perpendicular to the surface at the point of incidence.

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