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Straight across
Because light travels in straight lines. (unless some form of meta-material is present in its path).
i think the horizontal is the line go up and vertical is the line go straight across
If the two lines are parallel, they will never connect. A straight line drawn across those lines will intersect them at identical angles. If you have perpendicular lines, they intersect and all four angles that they make are 90 degrees.
Two straight lines that remain equal distance apart are parallel lines.