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从晶体的简正模方程出发,求得在二轴晶体中,当光线沿第二类光轴（光线轴）方向行进时,所对应的电场矢量和电位移矢量,并通过几何证明,验证所有折射光线在晶体内均在同一锥面上。
Starting from the simple normal mode of the crystal, the corresponding electric field vector and electric displacement vector are obtained when the light travels in the direction of the optical axis of the second kind (light axis) in the biaxial crystal. Through the geometrical verification, all the refracted light In the crystal are in the same cone.