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I'm guessing this questioner meant "Why do mirrors reverse, etc."

That's the well known phenomenon of "lateral inversion" of the image in a flat

mirror.

This is the basic explanation:

1) The mirror reverses the object in the direction perpendicular to the surface of the mirror. That's all it does. The mirror has no effect on left and right or on up and down.

2) However, we usually find it hard to notice this "front to back" inversion. That results in us "seeing" the image as reversed from left to right.

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