This paper expounds the theoryofmagnetism lens. According to the theory, the formula and geometrical optics theory, the writer finds out a way that can decide the position ofmagnetism lens.
阐明了磁透镜原理，依照磁透镜理论和几何光学理论，给出一种确定磁透镜位置的方法。
2
But Maxwell's work in the theoryof electricity and magnetism far overshadows his other work.
然而，麦克斯韦在电磁理论方面的成就，使他的其他成就相形见绌。
3
Skilled electricians learn the theoryof electricity, magnetism, and electrical safety before they begin working with electrical systems.