angle of incidence

Also called incidence. Optics, Physics. 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.
(on an airplane) the angle, usually fixed, between a wing or tail root chord and the axis of the fuselage.
Chiefly British, angle of attack ( def 1 ).

1620–30 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
angle of incidence
1.  the angle that a line or beam of radiation makes with the normal to the surface at the point of incidence
2.  another name for angle of attack
3.  Also called: rigging angle of incidence the angle between the chord line of an aircraft wing or tailplane and the aircraft's longitudinal axis

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
angle of incidence  
The angle formed by a ray or wave, as of light or sound, striking a surface and a line perpendicular to the surface at the point of impact.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Basically, the lower the angle of incidence for the basketball, the smaller the
  apparent size of the hole.
That's because the reflectivity changes with the angle of incidence but exactly
  how is not known.
The angle of incidence is the angle between the aircraft's longitudinal axis
  and the chord of the wing.
The frequency and the angle of incidence can often be changed to optimize link
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