a bisector splits an angle into to congruent angles
(also called an angle bisector)
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A bisector is a ray or segment which cuts an angle in half.
when a ray bisects an angle, it does all of the following expect what
Ray BD is a bisector of angle EBA.
it is the angle between the direction of the incident ray and the refracted ray.
Angle of emergence is the angle which the normal makes with the emergent ray.