A very narrow path of light represented by a line with an arrowhead showing the direction in which it is travelling is called a ray. For example - A Torch
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Yes.
Yes it names the same ray. For example in a square ABCD you can also call it DCBA or BCDA etc.
yes, a ray does have infinite length.true
Yes, both a ray and a line go on forever, but unlike a line, and like a line segment, a ray has an endpoint.
No. Line CD is the same as line DC, but rays are always named from the origin point, so ray DC is a ray pointing in the opposite direction from ray CD.