本文分别讨论了机械波、电磁波、物质波在两种介质的分界面正入射传播时产生半波损失的本质。
In this paper, we discuss the nature of half-wave loss about mechanical wave, electromagnetic wave and matter wave respectively.
在极紫外波段，任何材料都存在严重的吸收，因此采用多层膜实现高反射率，是构建正入射式光学系统的唯一途径。
All materials have strong absorption in EUV region. Therefore, using multilayer coatings is the only approach to construct normal incidence optical systems.
给出了正入射条件下铝漫反射板在紫外真空紫外波段的漫反射特性及硫酸钡和聚四氟乙烯（PTFE）漫反射板在紫外波段的漫反射特性；
Characteristics of a ground aluminium diffuse plate at ultraviolate vacuum ultraviolate(UV VUV)and that of a BaSO 4 and a polytetrafluoroethylene (PTFE) diffuse plate at UV are described.
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