i will never understand why mirrors flip the image horizontally but not vertically

May 17, 2020 · 5:46 AM UTC

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Replying to @aaronpk
Gravity. Duh.
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Replying to @aaronpk
Every 6 months I watch a video with the explanation, then I say “of course, it makes sense now”. Then time passes. Rinse repeat.
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Replying to @aaronpk
No you can’t do that to me on a Sunday morning - that’s in my head now, all day!
Replying to @aaronpk
I like this explanation: youtube.com/1t4dOPxKgrY

Why Do Mirrors Flip Left & Right (but not up & down)?

Go to https://nebula.tv/minutephysics to get access to Nebula (where you can watch MinuteBody) plus you'll get a 20% discount on an annual subscription. Supp...

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Replying to @aaronpk
I had found this video from @thephysicsgirl on this topic very interesting. youtube.com/watch?v=vBpxhfBl…
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Replying to @aaronpk
👻 they dooooooOoooOoo 👻
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Replying to @aaronpk
I've watched detailed explanation several times, and I always end up thinking, “oh, that makes perfect sense”. Then when I think about it later I still don't get it.
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Replying to @aaronpk
Damn you. Just when I was about to try to go to sleep you pose this question.
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Replying to @aaronpk
As coincidence would have it!
Jonathan Church @jonathan_church
17 May 2020
I’ve been pondering why images in mirrors are flipped L-R but not up-down. I’ve concluded that it’s because, when we turn to face a mirror, we invariably prefer turning about a vertical axis (thereby staying the right way up) than a horizontal one (and flipping ourselves over).