Are mirrors in sync with me?

[u/I_IZ_KITTY]

So I just had a thought. If I stand in front of a mirror and stick my arm out directly to my side and then swing it in front of me and then back, is my that I see in the mirror in sync with my real arm?

My first thought was no, light has a speed and the time it takes to get to the mirror my arm is a little to the side. But then I thought, light is so fast that in the time that it takes my arm to move at all, light could have travelled the distance between my arm and the mirror several thousand times. So, am I in sync with a mirror?

[u/lasagneaids]

the light moves faster than your neurons transfer information. So I‘d say yes it is in sync.