A incoming ray is the light reflecting upon a solid surface without it being absorbed. The incoming light is also referred to as vacuum wavelength.
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The incoming angle is the angle at which something comes at some other object. For example if you hit a ball on a pool table against the side, the incoming angle is the the angle at which the ball comes at the table.
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.