How to see if the mirror is single-sided or double-sided?

The simplest way to identify is to look at the distance with your finger in the mirror. The coating of "single mirror" is behind the glass, and the light is reflected on the coating. Because there is a layer of glass between the coating and our fingers, there is a distance between the image in the mirror and the nails. The coating of the "double mirror" is in front of the glass, so there is no distance between the nail and the imaging.

The "double mirror" is installed between two rooms. Both rooms have lights on. When you look at the other room from one room, you will see a mirror reflecting the environment of the former. But if you look from the back room, what you see is transparent glass, and you can see the situation in the opposite room.

Extended data:

Common sense of distinguishing stainless steel mirror from glass mirror;

In fact, it is not difficult to distinguish between stainless steel mirror and glass mirror. When the stainless steel mirror is struck, the sound is slightly dull, while the glass mirror is crisp. The edge of stainless steel mirror is thin and the edge of glass mirror is thick; In addition, the glass mirror image is clearer.

Single-sided mirror and double-sided mirror are widely used in prisons, interrogation rooms of public security organs, mental hospitals, research rooms of university scientific research institutions, large conference rooms and so on. You can achieve the effect that you can't see the inside from the outside, but you can see the outside from the inside.

Baidu encyclopedia-one-sided mirror

Baidu encyclopedia-two-way mirror

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