You know those windows in police rooms? Like one side you can see into the questioning room but in the questioning room it’s a mirror? How are those made? How do you see out of them?
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You know how during the day you can’t see the stars because the sky is too bright? A two way mirror works on the same principle. It’s a piece of glass with a reflective coating on the backside, but the reflective coating doesn’t reflect *all* of the light. It lets some through. This way, if one of the rooms is dark and the other is bright, people in the bright room can only see their reflection because there’s so much more light reflecting than coming in from the dark room. People in the dark room can only see light from the bright room because their reflection is so dim.
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