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.
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。
3
The parallel light rays of the prnicipal axis that approach a convex lens can converge to the focal point.