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what is later invertion?

Lateral inversion is the reversal of an object when the image is formed in a flat mirror.

This reversal is only in the direction perpendicular to the surface of the mirror.
However, the effect is often seen by a person as a "left-right" reversal with the
"front-back" reversal not noticed. That's the reason it's called lateral inversion.
"Lateral" means sideways.


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