会拐弯的眼睛 在上《光的折射》一课时,先在教桌上放一个空茶缸,茶缸底部放上一枚硬币。让一名学生坐在凳子上,调节茶缸和眼睛的垂直高度,使眼睛刚好看不到茶缸底部的硬币。这时往茶缸中倒水,随着水位的升高,这位同学就能看到这枚硬币,从而得出这是因为光的折射的原理,引出课题。 Turn the eyes on the “refraction of light,” a lesson, first on the table put an empty tea cylinder, put a coin on the bottom of the tea. Have a student sit on a stool, adjust the vertical height of the tea pot and eyes so that the eyes just do not see the coins on the bottom of the tea pot. At this moment, pouring water into the tea pot, the classmate can see the coin as the water level rises, and concludes that this is because the principle of light refraction leads to a topic.