All rays in fact give live birth. Their relatives, the skates, do lay eggs. Those egg cases are called mermaid's purses.
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incident ray-the light ray striking a reflecting surface is called the incident ray. reflected ray-the light ray obtained after reflection from the surface, in the same medium in which the incident ray is travelling , is called the reflected ray.
It depends on what the name of the initial point is because that defines the direction of the ray. If the initial point is c, then the ray must be called cd, but if the initial point is d, then the ray must be called dc.
The endpoint.
Such a ray is called a "bisector" of the angle.
It is called an arm of the angle.