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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Glass reflects about 5% of light. The one way mirror effect is an illusion where the room on the mirror side is so bright that the 5% that is reflected is brighter than the light passed through from the window side. The reflection washes out the view from the other side. For this to work, the room on the window side must be dark or much less dimly lit than the room on the mirror side.
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