First, the relation between the dispersion of the fiber and the propagation constant and equivalent refractive index is presented.

文章先给出了光纤色散与光纤传播常数及等效折射率的关系。

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The retrieved size distribution will have a large bias if the equivalent refractive index is employed in light scattering techniques.

因而对多分散系外混合气溶胶粒子系统如使用等效折射率，则由光散射技术测定的谱分布与实际谱分布有很大的出入。

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The principle and calculation method to design short-wavelength pass filters with a concept of equivalent refractive index is presented in this paper.

详细介绍用等效折射率概念设计短波通滤光片的原理和计算方法。

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