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有一次,我听了一节高三“凸透镜成像”实验课,实验后教者提出了三个问题。1.如果用挡板挡住凸透镜的一部分时,屏上能否形成一个完整的像?被挡的透镜背后屏上能否成像?首先学生回答,并争论。最后由教者演示,先从侧面遮挡,再从上边遮挡,均产生了完整的实像,而且被遮挡部分的背后屏上也形成了像。2.被遮挡部分背面的屏上成像,是因为光线直线传播产生的呢?还是光的干涉或衍射产生的呢?学生回答并争论,有的学生说光绕到了被遮挡部分的背后,是由于光的衍射;也有部分学生说这是由于光的直线传播产生的。
At one point, I listened to a senior high school “convex lens imaging” experiment class. After the experiment, the teacher raised three questions. 1. If a part of the convex lens is blocked by a baffle, can a complete image be formed on the screen. Can the image on the back of the lens be imaged? The student first answers and argues. In the end, the demonstrators demonstrated that they first blocked the sides and blocked them from the top, resulting in a complete real image, and an image was formed on the screen behind the sheltered part. 2. Is the on-screen imaging of the back of the sheltered part caused by the linear propagation of light, or is it caused by the interference or diffraction of light? Students answer and argue that some students say that light is trapped behind the sheltered part. The diffraction of light; also some students say this is due to the linear propagation of light.