coordinates - Why screen y coodinate is counted from top to bottom -

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when draw graps on mathematics or physics lessons origin of coordinate system in bottom left corner , y coord goes bottom. whe try draw on screen y-axis switches direction , coord system origin moves top-left corner. why so?

it's historical thing.

older crt monitors fire electrons @ screen in sweeping motion starting @ top, moving down screen, sweeping left right. complete sweep of screen typically 50-60 times second.

here's link web page on subject.


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