Change of the spatial distribution of a beam of radiation when it is deviated in many directions by a surface or by a medium, without change of frequency of its monochromatic components.
光束被某一表面或介质改变为多种方向，而不改变其单色光的频率时，所发生的空间光分布的改变。
Change of the spatial distribution of a beam of radiation when it is deviated in many directions by a surface or by a medium, without change of frequency of its monochromatic components.
光束被某一表面或介质改变为多种方向，而不改变其单色光的频率时，所发生的空间光分布的改变。
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