One way X-ray mirror glass belongs to the mirror, he is divided into two sides, one is the mirror surface, the mirror can be used to reflect the light, the other side not do any processing, the light can normal penetration. Unidirectional perspective glass commonly used in architectural glass, the installation of distinguish between positive and negative, mirror need outward, ordinary face. This installation can be from the outside can not see inside, from the inside can see outside. This effect is related to the intensity of the light, only when the indoor light than the outdoor dark, the effect is obvious, light indoor light than the outdoor, then the mirror effect will fail.