How to distinguish single-sided mirror and double-sided mirror, simple and practical, convenient and easy to learn

movies, we often see a kind of magical mirror.

When a person stands in front of a mirror, the image of the person will be reflected in the mirror, which is no different from an ordinary mirror. And when a person stands behind the mirror, the mirror becomes a piece of transparent glass.

So, what is the difference between this magical double-sided mirror and an ordinary mirror?

First of all, in terms of structure, this kind of double-sided mirror is basically the same as an ordinary mirror, which is composed of transparent glass and metal coating, of which the metal coating acts as a reflective surface. The only difference between

is the thickness and light transmittance of the metal coating.

The coating of ordinary mirrors is mostly silver or aluminum, and the coating is generally thicker and the light cannot penetrate.

The coating of the double-sided mirror is mostly aluminum or chrome, the coating is generally thin, and a small amount of light can penetrate the coating.

When the person is on the darker back, the opposite side of the mirror can be seen clearly.

and people on the brighter side, because of the light intensity, they can only see their own images, but cannot see the opposite side of the mirror.

common identification methods

Method 1: Put the coin in front of the mirror, and judge whether it is a double-sided mirror by observing the distance between the coin and the mirror.

When there is a gap between the coin and the mirror, the mirror is a normal mirror.

When there is no space between the coin and the mirror, the mirror is a double-sided mirror.

Method 2: Ordinary mirrors are generally installed on the wall, and both sides of the double-sided mirror are in contact with the air. Therefore, you can tap the glass with your hand to identify the type of mirror by whether the sound is dull and hollow.

Method 3: Use a strong flashlight to illuminate the mirror, and then observe whether you can see the other side of the mirror. If you can see the other side, it's a double-sided mirror. On the contrary, it is an ordinary mirror.