Why do mirrors reverse left and right but not up and down?

[ryan_kidz]

why do mirrors reverse left and right but not up and down?

thank you very much.
Ryan.

 

[lpfr]

Mirrors do not reverse up-down nor left-right. Your (up) head is always up and your right hand is always at right.

What a mirror reverse is front-back. If you are heading North, your image is heading south.

 

[rewebster]

A mirror can reflect 'upside down'---it just depends on the angle of reflection.

 

[jtbell]

From the Usenet Physics FAQ:

http://www.physics.adelaide.edu.au/~dkoks/Faq/General/mirrors.html

 

[Mk]

I'm wondering who the hell Trimotio and Fineas are. Like Alice and Bob, or are they random names, or what?

 

[rewebster]

I thought they were the 1/2 wave virtual non-local representative ghost MWI counter-equivalents of Bob and Alice.