focal-axis 焦轴
The axis is not changed equivalently, through managing multiple focal levels, can fully utilize axis space, keeping overall information while observing detailed information of key area.
坐标轴非等值变化通过多层焦点的交互控制实现，可以充分利用坐标轴空间，在观察重点区域详细信息的同时保持总体浏览。
Moreover, applying the matrix method in the close axis optics leads directly to the expression of the focal distance of magnetic lens if the matrix is transmitted by the lens.
此外，应用类似于近轴光学中的矩阵方法，山磁透镜传输矩阵，直接导出了该磁透镜的焦距的表达式。
The parallel light rays of the prnicipal axis that approach a convex lens can converge to the focal point.
只有在近轴光线条件下，平行光通过凸透镜才可近似聚焦于一点。
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