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Two Way Mirror, from the illuminated side, it is a mirror. From the dark side, it becomes transparent. And in this case, you can clearly see everything on the bright side. (For example, if there is light on one side of the interrogation room, the people inside will see the mirror. If there is no light on the side of the observation, the transparent effect will be seen; but if there is light on both sides, the effect of a semi-lens will appear) It widely used in advertising, such as infinity mirror, interrogation room and so on.