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A comment on Why Do Mirrors Flip Things Horizontally but Not Vertically? Here's the Physics. Parent comment

Re:Why Do Mirrors Flip Things Horizontally but Not Verticall... by jwatte on Wednesday October 07, 2020 @06:37PM (#24713627)
Most HN commenters are wrong. A mirror DOES flip one coordinate; the coordinate that is orthogonal to the plane of the mirror. That's what makes it a mirror, and not a window.
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