The normal line divides the angle between the incident ray and the reflected ray into two equal angles.
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A ray.
No. A ray is infinite on one side and ends at a point at the other. A line segment ends in two points. A ray can contain a line segment, as the distance between any two given points on the ray is a line segment.
Yes, because a ray is a line with an end point. It goes on forever in one direction.
A ray
yes, because a line segment is part of a line and a ray goes on forever and it does always happen