Is it a mirror or a 2-way glass? Before you undress or do anything privately in an unfamiliar place, stop and consider the fact that someone may be watching behind a mirror. “How can you tell,” you ask…With a straightforward test, and here’s how:
Place the tip of your fingernail against the reflection surface, and if there is a GAP between your fingernail and the image, then it is a REAL MIRROR. However, if your fingernail TOUCHES the photo, it is a 2-WAY MIRROR, and someone may be watching.