With the recent progress in miniaturized electronics, for any of us it is difficult to know that we are not detective these days; Cameras and transmitters can now be made so small and inseparable that most of us will not be able to find them, even if we know where to look them. Many people, who lean, still resort to less technologically advanced methods like peephol and two-way mirrors, however, this warning was spreading over the internet in April 1999.
First of all, we should clean up some confusing terminology. Topics are the message address panels that look like mirrors on one side but act like tinted windows from the other side - that is, if you are on one side of this type of panel, then this mirror appears in which you can see your Reflections are; If you are on the other side, then it acts as a window through which you can see everything (and everyone) on the other side. These panels are confusingly known as "single-sided mirror" and "two-way mirror", so to avoid additional confusion we will call them "transparent mirror".
The above mentioned nail test is a method for determining the difference between the first surface mirror and the second surface mirror, both of which are normal mirrors in a different fashion. With the first surface mirror, you will touch any image placed against it to its reflection because the reflected part of the mirror on the surface is properly placed. With a second surface mirror, a difference will be seen between the object and its reflection because better glass cover is included in the reflecting part of the mirror to better protect it. First-floor glasses are expensive and usually only used for specific applications such as fine optical instruments or lasers, in which the protective layer of glass will interfere with the light path or less precision. In this way, you are not likely to face any face that is used as a normal mirror in a home or dressing room; Very cheap second surface mirror for those applications is almost always used.
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