how do one way mirrors work?
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It has little to do with the glass and all about how you light the scenes on both sides of it. In general any glass will pass through some light and reflect some light. You can get slightly different coatings to change how much is reflected and how much is passed through but you can not have it work differently in one direction then the other. The only way to prevent light from getting passed through from the inside to the outside is to prevent light from hitting the glass in the first place. And this is done by keeping this side of the glass in complete darkness and the other side brightly lit.
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