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However only the most common type of two way mirrors can be caught using that method. You could also try knocking and trying to hear if there's a hollow s.p.a.ce behind the mirror. Remember, there doesn't need to be a huge s.p.a.ce back there, just enough to fit a small camera.
The test I would recommend would be the flashlight test (all somewhat newer phones have built in flashlights). Just press your flashlight (phone) all the way against the mirror and you'll definitely be able to tell if the light s.h.i.+nes through. This is due to how one way mirrors are fundamentally built.
If you haven't noticed yet, you basically have to be able to directly touch the mirror in order to verify if it's real.
One way mirrors are sometimes also referred to as two way mirrors. Technically a one way mirror is made using a two way mirror placed between a dark room and a well lit room. A mirror is basically a layer of gla.s.s on top of a reflective metal sheet. If this metal sheet is thin enough only a portion of the light shone upon it will be reflected. With a bit of testing, you'll be able to achieve something that reflects about 90% of the light shone upon it. Thus you'll have a slightly translucent reflective piece of gla.s.s. If you placed this new mirror in the wall between two rooms, person A in room A would be able to see his own reflection but at the same time a rough image of the other room. Now if person B entered room B, he would be able to see person A at 10% intensity and himself at 90%. That's why it's known as a two way mirror.
If you turn off the light in room A, all of a sudden, the person in room A can perfectly see room B, although he has lost the ability to see his own reflection. Person B would just see his own reflection in a seemingly normal mirror. Although the reflection would be slightly weaker, at around 90%, you would never notice the difference.
Voila, you now know how unrealistic most one way movie mirrors are.