The incident ray, the _________ at the point of incidence and the reflected ray all lie in the same plane.
normal
This is the First Law of Reflection: the incident ray, the normal at the point of incidence, and the reflected ray are coplanar. The normal is the perpendicular drawn to the reflecting surface at the point where the ray strikes.
“Surface” and “tangent” do not define the standard reference line of reflection, and “angle of reflection” is an angle, not a line that lies in a plane with rays.
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