How to tell whether the mirror on the hotel wall is transparent?

1, see if there is any distance between the finger and the finger in the mirror. Normal mirror, with a certain distance. Double mirrors, fingertips seamlessly connected. Cover the mirror with your nails. If there is a distance between the mirror and the nail, it is a one-sided mirror and can be used safely. If there is no distance between the mirror and the nail, it is a double mirror.

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.

2. Judgment method of brightness: The double 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.

Extended data:

The double mirror is made of ordinary glass by vacuum coating and chromium, aluminum or iridium film. This glass can reflect most of the projected light back. This kind of glass is installed in the car, so people can see the outside clearly when sitting in the car.

But people outside the car can't see everything inside. Widely used in prisons, interrogation rooms of public security organs, mental hospitals, research rooms of university scientific research institutions, large conference rooms, etc. You can achieve the effect that you can't see the inside from the outside, but you can see the outside from the inside.