Question

why do two parallel roads seem like they are converging towards each other smwhere in infinity and will meet?

Answer 1

because when u look object at distance far away from u it gets smaller. So lines appear to make smaller angle and therefore converge

Answer 2

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Keep in mind that your eyes perceive a fixed field of view. That is, you see a certain angle in front of you. They do not see a fixed distance across your line of sight. This means that the farther away for you you look, the more distance there is from one side of your FOV to the other. When you look at parallel railroad tracks that maintain a certain distance apart, they seem to converge as they go off into the distance. This is because the proportion of your field of view that the tracks take up diminishes.

Let's say the tracks are x meters apart and close to you, your FOV encompasses 6x meters across. That means 1/6 of your field of view is taken up by the tracks' separation. But far away from you, your field of view might encompass 600x meters across. This means the tracks would have converged to only take up 1/600 of your FOV. They're still the same distance apart, but the distance between them takes up less of your field of view. The brain interprets this as converging because if an image did this that was at the same distance in front of you throughout, it would actually be converging.

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