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在教学“凸透镜”的课上,我开门见山,直入主题,省略了课堂情境环节。把凸透镜原理等相关知识讲得十分详细,并让学生做了大量的练习。当时学生正确率极高,我以为这节课上得很成功。可是在几天后的测验中,不少学生在下面这道题:“蜡烛放在离凸透镜20 cm的主光轴上,在透镜的另一侧光屏上得到放大的像,若把蜡烛向透镜方向移动8cm,则所成的像一定是()A.放大的B.缩小的C.正立的D.倒立的”错误频繁出现。我百思不得其解,不知
In teaching “convex lens ” class, I go straight to the point, straight into the subject, omitting the classroom situation link. The principle of convex lens and other related knowledge is very detailed, and let students do a lot of practice. At that time, the students’ accuracy rate was very high. I thought it was a very successful lesson. However, in a few days after the test, many students in the following question: “candle placed 20 cm away from the main optical axis of the lens, on the other side of the lens to get a magnified screen, if the candle Move toward the lens 8cm, then the resulting image must be () A. Enlargement B. Shrinking C. Erect D. Inverted ”Errors occur frequently. I baffled, I do not know