对于直线，法线是它的垂线；对于一般的平面曲线，法线就是切线的垂线；对于空间图形，是垂直平面。
运动的法线方程；
根据渐近曲线的方程，具体给出主法线曲面的一族非直线的渐近曲线。
According to the equation of asymptotic curves, a family of nonlinear asymptotic curves are given to the principal normal surface.
利用光波面和光波法线面的曲线方程，得出了光波面上光轴角和光线轴角的表达式。
The expression of optic axial Angle and ray axial Angle on light wave plane can be obtained by using the curve equations of the wavefront of light wave and normal plane of light wave.
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