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一、问题的提出在透镜成像的光路作图教学中,我们时常要用到三条特殊光线,它们分别是:平行于主光轴的光线,过焦点的光线及过光心的光线.关于透镜对前面两种光线的作用规律,现有中学物理教材都能够结合相关实验及光路可逆的特点做出必要的分析与说明,帮助学生理解和掌握.但关于透镜对通过光心光线的作用特点,则讲得较为笼统,几乎是一带而过,缺乏充分论述,难以满足某些学生的认知需求.因此,在教学中,时常有学生问及"为什么通过透镜光心的光线传播方
First, the issue put forward In the optical imaging of lens imaging teaching, we often need to use three special light, they are: parallel to the main optical axis of the light, the focus of the light and light over the light center. The law of the former two kinds of light, the existing high school physics textbooks are able to make the necessary analysis and explanation to the relevant experiments and the characteristics of the optical path reversible to help students understand and master.However, the role of the lens on light through the light center, then Speaking more generally, almost by the way, the lack of adequate discussion, it is difficult to meet the cognitive needs of some students, therefore, often in teaching, students asked why the light transmission through the lens of the light side