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在几何光学中有关物、象运动问题,是学生掌握这部分知识的一个难点.这个问题,无论是学生的学习,还是教师的教学都感到棘手.根据现行中学物理课本的要求.笔者想就关于平面镜成象和透镜成象系统,对放大率与物、象运动速度的关系,并通过一些习题作一肤浅的讨论. 一、放大率与物、象运动速度的关系根据薄透镜成象公式:1/s+1/s′=1/f (1)结合线度放大率:β=s′/s (2)当物点沿主轴方向由距光心s_1、放大率为β_1处,移动到距光心s_2、放大率为β_2处,物点所移动的距离:
The problem of matter and elephant movement in geometry optics is a difficult point for students to master this part of the knowledge. This problem, whether it is the student’s study or the teacher’s teaching, is intractable. According to the requirements of the current middle school physics textbook, the author wants to talk about Plane mirror imaging and lens imaging system, on the relationship between magnification and object, image movement speed, and through a number of exercises to make a superficial discussion. First, the relationship between magnification and object, image movement speed according to thin lens imaging formula: 1/s+1/s′=1/f (1) Integral linear magnification: β=s′/s (2) When the object point moves along the major axis from the optical center s_1 and the magnification is β_1, it moves to From the optical center s_2, the magnification is β_2, and the distance moved by the object point: