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我在“光的反射”(初中物理第二册)一节课中安排了一个课堂练习,这道题是课后练习二的第3题。题目是:在黑暗的房子里,桌子上立着一平面镜,镜子后面是白色的墙。用手电筒正对着镜子和墙照射,从旁边看时,会发现墙被照亮了,而镜子却显得很暗。实际做做看,并说明为什么墙反而比镜子亮。学生解答此题有困难,难在学生不能很好地理解题目的意思,想象不出题目所表述的物理模式。如果老师不辅以其他手段,单靠讲解是不容易使学生明白的。在实际教学中我加了一
I arranged a class exercise in the “Reflections of Light” (Secondary Physics Physics Book II) class. This is the third question of Exercise 2 after class. The title is: In the dark house, a flat mirror stands on the table, and behind the mirror is a white wall. With the flashlight facing the mirror and the wall, when you look from the side, you will find that the wall is lit and the mirror is very dark. Actually do look and explain why the wall is brighter than the mirror. It is difficult for students to answer this question. It is difficult for students to understand the meaning of the topic well, and it is impossible to imagine the physical model described by the topic. If the teacher does not supplement with other means, it is not easy for students to understand. In the actual teaching I added