When we visit toilets, bathrooms, hotel rooms, changing rooms, etc. How many of you know for sure that the seemingly ordinary mirror hanging on the wall is a real mirror, or actually a 2-waymirror (i.e. they can see you, but you can't see them). So try this simple test to distinguish two-way mirrors from ordinary mirrors:
Place the tip of your fingernail against the reflective surface and if there is a gap between your fingernail and the image of the nail, then BE CAREFUL, for it is a 2-way mirror.
However, if your fingernail directly touches the image of your nail, then it is a genuine mirror.