A two-way (2 way) mirror is glass which, on one side, provides a reflection, but on the other side, functions as a window. It is used to observe people so that they are not aware that they are being watched, or who is watching them. Two-way mirrors (also known as one-way, transparent, and observation mirrors) are common in police stations or psychological institutions, but there are other, less obvious settings where people worry about being watched, such as dressing rooms and workplaces. If you are concerned about a particular mirror, here's how to tell if there's someone looking on the other side.
Steps to check mirror:
1).Observe how the mirror is installed. A normal mirror is hung against the wall, but an observation mirror is set into the wall. If the wall is behind the mirror, it's probably a normal mirror.
2). Turn off the lights and hold a flashlight or even a small personal flashlight to the mirror. If it is a two-way mirror, the room on the other side will be illuminated.
3) Press your eyes against the mirror and cup them with your hands, creating a dark "tunnel" to block out the light. When you do so, the light in the observation room will be brighter than the light on your side of the mirror, and you should be able to see something beyond the glass.
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