how do one way mirrors work?
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As others have said, it’s all about the lighting. But I like numbers, so…
Suppose you had a mirror that was 50% reflective and 50% transmissive. And suppose the bright room had a brightness of 100units, and the dark room only 40units. (Doesn’t really matter what these units are.) In the bright room, you’d see 50units of light reflected (50% of 100units). But you’d also see 20units coming through from the dark room (50% of 40units). So in total, you can see 70units in the mirror, but most of this is coming from the bright room. Meanwhile in the dark room, you’d *also* see 70units of light, with 50units of this coming from the right room.
By tweaking the brightness of the two rooms and how reflective or transmissive the glass is, it can be pretty close to a one-way mirror.
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