How to tell if there is a camera behind the mirror?

The traditional way to distinguish a double mirror is to point your finger at the mirror. If the nail tip can directly touch the reflection image of the nail, it is a double mirror, and vice versa. Because the mirror is reflected by the mercury plating on the back of the glass, and the glass itself has a thickness, it is several millimeters away from the scene in the mirror when it is close to the mirror.

This method is not suitable for all double mirrors, because as long as a layer of glass is added in front of the double mirrors or a coating is sandwiched between the glasses, this method will not work.

2. See if there is a mezzanine.

The use condition of the double-sided mirror is that the observed person is in a bright environment and the person behind the mirror is in a dark place, so that the effect of voyeurism can be achieved.

Extended data:

It is nothing new that hotels and fitting rooms are exposed to hidden pinhole cameras to take candid photos. The camera is getting smaller and smaller, and the stealth is getting wider and wider. It is in every peeping pinhole in hotels, shopping malls, homestays, rental houses and toilets.

There is a black industrial chain, from illegally producing monitoring equipment to refitting equipment to daily necessities such as remote controllers, routers and sockets, to putting them in hotels, shopping malls and other places, until candid photos and videos are clearly priced online, and the interest chain is constant. Almost every link is illegal, with low cost and easy illegal income.

People's Network-Nanjing Hotel has hidden double mirrors? Police rumor: stainless steel mirror

People's Daily Online-People's Quick Comment: The proliferation of "pinhole cameras" needs to be dealt with with with heavy punches.

People's Network-Up-posture double-reverse pinhole cameras emerge one after another, teaching you several tricks to prevent peeping.