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How Mirrors Work

WATCH: Why Mirrors Flip Things Sideways But Not Upside Down

The Huffington Post | Macrina Cooper-White | Posted 02.18.2015 | Science

It's a simple question, but one that may never have occurred to you: why do mirrors seem to flip things horizontally but not vertically? Or, in philos...

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?