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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They’re also called half-silvered mirrors. If you put a very thin layer of reflective material on a piece of glass, instead of the thicker layer you’d use to make a normal mirror, some light from each side can shine through and some of the light will bounce off.
If one side of a half-silvered mirror is a brightly lit room and the other is a dimly lit room, both sides will see an image composed of half the light striking the mirror from the bright side and half the light striking it from the dark side, i.e., an image composed of mostly light from the brightly lit room.
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