鬼点
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Ghost Focus generator 幻像发生器
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When light inputs the surface of optical elements, there is reflection as well as refraction, so ghost light come into being, its focus is called ghost image.
光学元件表面在折射时都存在反射，从而存在设计意图之外的杂散光，其会聚点即所谓鬼点。
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