OSLO中,aperture radius 的solves,定义为If no aperture radius value is specified, OSLO will assign an aperture radius value equal to the sum of the magnitudes of the paraxial axial ray height and the paraxial chief ray height on the surface.
请问 1) 为什么 aperture radius value是the sum of the magnitudes of the paraxial axial ray height and the paraxial chief ray height on the surface ?