Analytical expressions of groove parameters are derived up to the forth order with (ray-tracing) theory of geometry optics.

根据几何光学的光线追迹理论，推导了光栅参量的四阶解析表达式。

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The expressions of the affine fractal interpolation function and the locally explicit presentation of the vertical scaling factors are presented on the basis of fractal geometry.

在理论分析的基础上给出了自仿射分形插值函数的表达形式和垂直比例因子的显式表达形式。

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