如果光学系统全部表面的曲率中心位于同一直线上,即系统光轴上,那么包括折射或反射球面的光学系统,称为共轴光学系统。而且有两个球面的单一透镜若具有曲率中心不重合,则其光轴是完全可以测出的。光学系统中透镜的同心度是以其相应的定位来达到的。 If the center of curvature of the entire surface of the optical system is on the same line, that is, on the optical axis of the system, an optical system including a refractive or reflecting sphere is called a coaxial optical system. And if a single spherical lens with two centers of curvature does not coincide with the center of curvature, its optical axis is completely measurable. Concentricity of lenses in optical systems is achieved with their corresponding positioning.