Bilingual edition: English is preserved and Chinese follows each unit. Terminology uses the confirmed v20260916 glossary; automated semantic review remains traceable.
中英双语版：英文原文完整保留，中文紧随对应单元；术语采用 v20260916 确认表，自动语义审校结果可追溯。

Normal Reflection Coefficient

正常反射系数

The reflectivity of light from a surface depends upon the angle of incidence and upon the plane of polarization of the light. The general expression for reflectivity is derivable from Fresnel's Equations. For purposes such as the calculation of reflection losses from optical instruments, it is usually sufficient to have the reflectivity at normal incidence. This normal incidence reflectivity is given by

光从表面的反射率取决于入射角和光的偏振平面。反射率的一般表达式可以从菲涅耳方程导出。对于诸如计算光学仪器的反射损失等用途，通常只需知道垂直入射时的反射率。这种垂直入射时的反射率为
Calculation to be added.
Thin films
薄 films
Example calculation
示例计算
待添加的计算。
 Index

Reflection concepts
索引反射概念
 
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Multi-Layer Anti-Reflection Coatings

多层抗反射涂层

A single layer anti-reflection coating can be made non-reflective only at one wavelength, usually at the middle of the visible. Multiple layers are more effective over the entire visible spectrum.

单层抗反射涂层只能在特定波长下变得非反射，通常是在可见光的中间波长区域。多层结构在整个可见光谱范围内效果更佳。
 Index

Reflection concepts

Reference
Meyer-Arendt
索引 反射 概念 参考 Meyer-Arendt
 
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