曲折光线法和解波动方程是分析平面光波导的基本方法。
The solving of wave equations and tortuous ray method are fundamental methods of analysing plane optical waveguiding.
本示差折光计的设计是基于光线在两液体界面间折射的原理。
The differential refractometer described here was designed on the principle of light refraction at two liquid interfaces.
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