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Mirror Reflection Explanation

Mirror, Mirror on the Wall, How Come You Don't Invert at All?

Robert L. Wolke | Posted 08.05.2012 | Science
Robert L. Wolke

When you look into a full-length mirror and raise your right hand, your image raises its left hand. And yet both your heads are still on top. So how does a mirror reverse things right to left, but not top to bottom? Does the mirror somehow know horizontal from vertical?