The light intensity distribution exhibits straw hat shape on a certain conditions, in other word to say, the central light intensity is less than acroteric light intensity.
在一定条件
，
面上
光强分布会呈现中心光强小于周围光强“草帽型”分布。
;周围The light intensity distribution exhibits straw hat shape on a certain conditions, in other word to say, the central light intensity is less than acroteric light intensity.
在一定条件，面上光强分布会呈现中心光强小于周围光强“草帽型”分布。
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