[China Glass Net] In general, one-way glass can only see the other side from one side, and both sides of the two-way glass can see each other.
Two-way glass, that is, two-way mirror, also known as single-sided see-through glass - is made by vacuum coating on a common glass with a film of metallic chromium, aluminum or tantalum. This glass reflects most of the projected light back. This kind of glass is installed in the car. People sitting in the car can clearly see the outside, but people outside the car can't see everything inside the car.
Two-way glass can be used for indoor hidden observations. It is ideal for security and surveillance where it is needed for observation in the dark, but it is often used for voyeurism. In a well-lit room, the side of the single-sided mirror looks like a mirror, but from the other side it looks like an ordinary tinted glass window.
The secret of one-way glass is that the glass surface is coated with a very thin silver film or aluminum film. Such a glass does not reflect all of the incident light, but allows some of the incident light to pass. The reason why the one-way glass is unilaterally visible depends on the intensity of the light. The invisible side is brighter and the visible side is darker. Most of the invisible glare is reflected by the silver film, but the weak light from the side can not be seen clearly because of the strong reflected light, and even cannot be seen. Therefore, when you look at the bright side, it looks like an ordinary mirror. On the contrary, on the dark side, since the strong light shines through the thin silver film from the bright side, the weak reflected light emitted by itself is invisible.
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