2023年12月14日 06:25

This is a mirror that we normally use at home. When we hold the mirror with our fingers, you will find a gap between the finger and the mirror. To see it clearly, we turn our fingers into ID cards. This makes the gap more obvious. Why is there a gap? This is because the reflective layer of the mirror is applied to the back of the glass. Come and follow the lens with me to take a closer look at the back of the mirror. Can you see it? The reflective layer is applied to the back of the glass. So when you hold the mirror with an ID card, it is impossible for the ID card to directly contact the reflective layer. Because there is a layer of glass in the middle, there is a gap. The thicker the glass, the bigger the gap. This is also a mirror. We also hold it with an ID card. Have you noticed what is the difference from the ordinary mirror just now? Yes, new friends will find that there is no gap between the ID card and the mirror. Let's take a look at the back of this mirror. Oh, there is no reflective layer on the back. It seems to be a mirror, but it feels a little darker than the one just now. So where is the reflective layer? It turns out that the reflective layer is applied to the surface of the glass. In this case, when we hold the glass with an ID card, we can directly contact the reflective layer. Naturally, there will be no gap. This mirror is the legendary unidirectional transparent glass, also known as a unidirectional mirror. This unidirectional mirror is usually used in public security agencies, interrogation rooms, classrooms, etc. Look, this is a classroom. This mirror looks like an ordinary mirror. In fact, it is a unidirectional mirror. This side of the classroom is the back of the unidirectional mirror, which is the back observation side. We look at this glass from the classroom and feel that it is an ordinary mirror. But you can't imagine that there is another sky behind the back of this mirror. We now follow the lens into the observation room. From the front of the unidirectional mirror, that is, the observation side, we can see the situation in the classroom completely. And the people in the classroom can't see at all. In real life, some criminals will use this feature of the unidirectional mirror to peep into other people's privacy in the hotel, bathroom, or bathroom. Fortunately, we know how to identify a unidirectional mirror. It is to use your finger or ID card to hold the mirror to see if there is a gap to judge whether it is a unidirectional mirror. But let me tell you, if I were a bad guy, I would add a layer of glass in front of this unidirectional mirror. In this way, when we hold the mirror with our ID card, you will find that the gap reappears. You see, let's compare. This is without glass, there is no gap. This is with glass, the gap reappears. In this case, can't we identify a unidirectional mirror? Don't worry, I'll give you another ultimate trick. We first turn off the light in the room, then turn on the mobile phone flash or flashlight, stick it on the mirror, look into the mirror. If it is a unidirectional mirror, all the ghosts behind the mirror will show up. Finally, I remind everyone, whether we are renting a house or living in a hotel, or in the laundry center and public toilet, we must pay more attention to protect personal privacy.