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大多数镜子的金属镀层都比较厚,入射光线射到镜面上,光线将被反射。如果金属镀层足够薄的话,那么入射光线将有一部分被反射,另一部分光线将穿过这层金属镀层,这种镜面就叫做半镀银镜面。常规家用防盗门的猫眼
Most mirrors have a thick metal coating. The incident light hits the mirror and the light is reflected. If the metal coating is thin enough, then part of the incident light will be reflected and the other part of the light will pass through this metal coating. This mirror is called half-silvered mirror. Conventional home security door cat eyes