How to distinguish a double mirror from a single mirror?

Two-sided mirror and one-sided mirror can be distinguished by judging with your fingers, tapping the mirror to listen to the sound, judging the brightness, and watching with a flashlight in the dark.

1, judging with your finger: point your finger at the mirror to see if there is a distance between your finger and the finger in the mirror. Normal mirror, with a certain distance. Double mirrors, there is no gap between fingers and mirror fingers, and fingertips are seamlessly connected. Because ordinary mirrors have a reflective layer in front of the glass, the reflective layer is generally plated on the back, so it is separated by the thickness of a piece of glass.

2, knock on the mirror to listen to the sound judgment: the sound is empty and has a slight echo, then this mirror may be a double mirror. Because the thickness and material of double mirror and single mirror are the same. But in general, the back of a double-sided mirror is empty, while most of the single-sided mirrors are mounted on the wall, and there is a wall on the back. But sometimes because of the hardness of the mirror, you can't hear the difference in sound when you knock.

3, brightness judgment: stick your small cosmetic mirror on the mirror to compare the brightness of the image, according to your face, if the brightness of the big mirror image is significantly lower than the small cosmetic mirror, it may be a double mirror.

4. Look with a flashlight in the dark: According to the principle that double mirrors transmit light to each other, double mirrors have a feature that they can see the bright side from the dark side. If you turn off the light on your side, you will see the opposite. So just turn off all the lights, point the flashlight at the mirror or stick your eyes on the mirror, block the light with your hands, and look carefully at whether there is anything behind the glass.

The danger of double mirrors:

Because of the particularity of double mirrors, they are often used by criminals as voyeurs, so they are very dangerous and will invade privacy. Double-sided mirror, also known as single-sided transparent glass, is made of ordinary glass by adding chromium, aluminum or iridium film through vacuum coating. Double mirrors are widely used in scientific research institutes and large conference rooms in colleges and universities. You can't see outside from the inside, but you can see inside from the outside.

If there are two mirrors in the room, it is likely that someone will spy on your personal behavior. Because many lawless elements have installed surveillance cameras in the mirrors, taking pictures of the guests' every move and bathing process, and then posting this video on the websites of various platforms to make some irresponsible money, it is best to have a look when you encounter this kind of mirror in the hotel.