Question

Why the light rays coming from infinity are parallel?

Answer 1

In reality, light rays are never perfectly parallel because the distance to their source point is always a finite distance.

However, if that distance is vast ( across the Universe, or just across a Galaxy ) then the distance traveled is vastly greater than the distance of separation of the two rays, so the rays are very nearly parallel.

So, in theory, if the distance traveled is approximately infinite, and the separation of the rays is close to zero, then we can call them parallel

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Answer 2

If the distance is approx infinite and the separation of rays is 0 then the light rays are said to be parallel