How to judge whether a hotel mirror is a double mirror?

The hotel mirror can be seen as a double-sided mirror as follows:

First, the finger judgment method

See if there is a distance between your finger and the finger in the mirror. Normal mirror, with a certain distance; Double mirrors, fingertips seamlessly connected. Ordinary mirror: there is a gap between the finger and the mirror finger. Principle: Because an ordinary mirror is glass with a reflective layer in front, the reflective layer is generally plated on the back, so it is separated by the thickness of a piece of glass.

Second, knock on the mirror to listen to the sound.

Knock on the mirror and listen to the sound. When you find that the sound is hollow and there is a slight echo, then this mirror may be a double mirror.

Principle: 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. Theoretically, knocking method can be distinguished, just as we use knocking method to check the hollowness of the wall when we hand in the new house.

Third, the brightness judgment method

Stick your little makeup mirror on the mirror to compare the brightness of the image and look at your face. If the brightness of the big mirror is obviously lower than that of the small cosmetic mirror, be careful.

Principle: The double-sided mirror uses about 50%~70% reflective layer, so it is darker than the ordinary mirror. Take out the cosmetic mirrors you carry with you and compare them together to see if there is a big difference in brightness.

Fourth, look with a flashlight in the dark.

Turn off the light and shine the flashlight in the direction of the mirror.

Principle: A feature of double mirrors is 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.

Five, the enemy knows my secret method.

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, so you can tell.