Ballistics: The angle between the trajectory of a projectile and the surface it hits. An AoI close to 90° reduces the risk of deflection.

Optics:

The angle from the normal at which light strikes a surface. Snell's law can be used to calculate at what angle light will bend at a change in index of refraction given the angle of incidence.

Angle of incidence. (Aëronautics)

The angle between the chord of an aërocurve and the relative direction of the undisturbed air current.

 

© Webster 1913

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