Question

what is point of incidence??​

Answer 1

Answer:

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

The angle that a straight line, ray of light, etc..,.meeting a surface ,makes with a normal to the surface, makes with a normal to the surface at the points..

(or)

The angle , usually fixed, between a wing or tail root chord and the acid or the fuselage...(｡◕‿◕｡)