应用光学h.2.6-2.7.pptVIP

Review:;The lateral magnification:;Cardinal Points(基点) Of An Optics System ;1. First and second principal planes(物方主平面和像方主平面);the first principal point物方主点;2.The First And Second Focal Points（物方焦点和像方焦点）;The properties of the focal point and plane;F;2.6 principal planes and focal points of a single refracting surface;According to the properties of principal planes, they are a couple of conjugate points H and H’ whose later magnification is equal to 1.;Multiply ll’ on both sides of the above equation.;We can draw a Conclusion: The two principal points H and H’ of a single spherical surface are just at the vertex of the spherical surface. That means the first and second principal planes coincide with(与…相互重合)the tangent plane crossing the vertex of the surface, as shown in Fig.2.20.;Fig. 2.20;2.6.2 Focal points of A Refracting Surface;铺催撵湛馒境例昔佬潍审喻铰沦纷茬鳃阎置臣醚薯扼盲憨赵竿粹撇桨嚼呆应用光学ch.2.6-2.7应用光学ch.2.6-2.7;Fig. 2.20;In Sec.2.6.1 we get the conclusion that the principal points of a spherical surface are just at the vertex point of the surface, thus the focal lengths are the distances from the vertex of the surface to the focal points.;Above equations are the focal length formula of a single refracting spherical surface. For the condition of reflection, since a reflection can be taken as a refraction just as if n’=-n, we can get;治苛呜兆伟惠屏桔仕矩赞奠准欧茹拯言碳斥药崎颂监嗡齐田油唇阶臼册芝应用光学ch.2.6-2.7应用光学ch.2.6-2.7;2.7 Principal planes and focal points of a coaxial(共轴的)spherical system;According to the properties of the second focal point F’, any ray which is parallel to the axis will get across the second focal point F’ after passing through the optical system.;So that we can calculate a paraxial ray which is parallel to the axis by using the paraxial ray tracing formula, the intersection point of the ray after passing through the system and the axis will be the second focal point. ;Eqs.(2.2) to(2.5)or(2.7) to(2.10);f’ ?;FFL(物方顶截距,lF): 前截距,第一面的顶点O1到F的距离 BFL(像方顶截距,l’F):后截距,最后一个面顶点OK到F’的距离;Assignment ： ;F’;C