Question

What is angle of incidence ?​

Answer 1

In geometric optics, the angle of incidence 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. The ray can be formed by any wave: optical, acoustic, microwave, X-ray and so on.

Answer 2

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• The angle between the incident ray and the normal at the point of incidence.
• The angle which an incident line or ray makes with a perpendicular to the surface at the point of incidence