Accordingly, the first-order modified formula for transmitted intermediate points and refracted points is derived and whole ray-path can be computed for refracted ray iteratively segment by segment.
据此即可分别推导出透射中间点和折射点的一阶修正公式，进行折射线逐段迭代计算求出整条射线路径。
2
The filament current and X-ray power supply voltage are checked before the exposure signal can be transmitted.