The angle does not hit anything! A ray of light hits a mirror or glass block and the angle that the ray makes with the vertical at the point of contact is the angle of incidence.
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If I remember correctly, the angle that the light makes with the plane of the surface is called the incident angle.Incident angle.
The angle is the same but on the other side of the perpendicular to the surface of the mirror at the point at which the light hits the mirror.
angle of incidence
The angle between the ray and the perpendicular to the mirror (NOT the mirror itself), at the point where the ray hits the mirror is called the angle of incidence.
Yes, the angle of incidence always equals the angle of reflection when a straight ray of light hits a mirror that isn't bent.