The viral “how does the mirror know” explained

The fact this needs to be explained is both frightening.... And explains a lot.

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People don’t understand light

The saddest thing is, some people will still not understand.

I can't believe this many people don't know how a mirror works.

The fact that this went viral just shows how breathtakingly stupid the population is

I wonder who are the people who do not understand it probably the ones who didn't get well education.

Pay attention in Optics 101 and you wouldn’t ask this

Still hard to believe this

do you understand it now because i still don't..

the fact that this needs to be explained...