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初中各版本教材中都有平面镜成像实验,它是初中光学重要的实验之一.笔者在多次听课和上课过程中发现,课堂上普遍存在学生虚假探究、探究不深、理解不透的现象.分析其原因可能有很多:比如平面镜成像现象在日常生活中比较常见,学生往往根据经验就得出结论,学生对像距和物距是像点和物点到玻璃板前表面的距离,还是像点和物点到玻璃板后表面的距离并不了解和理解等等.如何将这一实验设计得有趣而科学、简单而深刻,笔者在教学中做了一些有益的尝试.
There are plane mirror imaging experiments in all textbooks for junior high school students. It is one of the important experiments in junior high school optics. The author found that during the course of many lectures and classes, there were widespread false inquiry, inexploration, and incomprehensibility. There may be many reasons for the analysis: For example, the phenomenon of plane mirror imaging is more common in daily life. Students often draw conclusions based on experience. What is the distance between the pupil and the object distance from the image point and the object point to the front surface of the glass plate? The distance from the object point to the back surface of the glass plate is not understood and understood. How to design this experiment to be interesting and scientific, simple and profound, the author made some useful attempts in teaching.