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一、《光的折射》实验改进 人教版教材第十二册《光的折射和反射》实验3中,第二步:『让手电筒光通过直缝射入杯内,从缝的对面观察,光射在杯壁的什么位置?在杯壁的白纸上做记号。』第二步:『在杯内倒入水,不改变光射入方向。观察光射在杯壁的位置有什么变化。』这个实验的关键在于手电筒光射入的方向不能改变、电筒只要稍稍动一下,就不好进行对比实验。这对小学生来说难度太大。颁县新安学校的汪老师做了如
First, the “refraction of light” experiment PEP Tenth Edition “Light refraction and reflection” Experiment 3, the second step: “Let the flashlight light into the cup through the straight seam, from the opposite side of the seam observation, Where is the light shining on the wall of the cup? Step 2: ”Pour water into the cup without changing the direction of light entering.“ Observe the changes in the position of light in the cup wall. ”The key to this experiment is that the direction of the flashlight can not be changed. The flashlight is not good enough to conduct a comparative experiment with just a few strokes. This is too much for primary school children. Wang County, Xin County schools made like