Maxwell equations: Lorentz force, plane electromagnetic waves, radiation, light waves, reflexion, refraction, Huyghens principle, diffraction, interference phenomena.

麦克斯韦方程组：洛仑兹力，平面电磁波，辐射，光波，反射，折射，惠更斯原理，衍射，干涉现象。

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From the Angle of wave motion optics, on the principle of Huyghens, explaining the light of refraction. Simplifying the picture of the light of refraction and then getting a simple drawing method.

从波动光学的角度，用惠更斯原理解释了光的折射现象，根据惠更斯原理所作的折射光线进行简化，得出较为简单的作图方法。

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