angle of 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.
- (aeronautics) The angle, usually fixed, between the chord line of a wing or horizontal stabilizer and the axis of the fuselage, measured at the root. In UK called the angle of attack.
angle that straight line makes with the normal of a surface