小学自然教材第十册第六课是《彩虹的秘密》,教材设计了两个实验:一是用三棱镜在阳光的照射下,分出赤、橙、黄、绿、青、蓝、紫七色光。二是用喷雾器背着阳光喷水,可看到七种色光。 第一个实验,对小学生来讲,较难从科学角度来理解。第二个实验,能证明阳光在小水滴折射下分散出七种色光,但不利于全体学生细致的观察。 为了让学生进一步观察彩虹的颜色、理解彩虹的成因,我设计了一个捕捉“彩虹”的实验。用一个透明的圆形玻璃水槽,放入半槽水,放到阳光照射的窗台上。这时,窗台下的阴影处立刻出现一弯“彩虹”(形 Primary school natural textbook tenth book sixth class is “the secret of the rainbow,” teaching materials designed two experiments: First, with the prism in the sunlight, the red, orange, yellow, green, blue, purple seven-color light . The second is sprayed with sunshine water spray, you can see seven kinds of shade. The first experiment, for pupils, is more difficult to understand from a scientific point of view. The second experiment, to prove the sun under the refraction of small droplets dispersed seven kinds of shade, but not conducive to all students careful observation. In order for students to further observe the color of the rainbow and understand the causes of the rainbow, I designed an experiment to capture the rainbow. Use a clear, round glass sink into a half-bowl of water and place on a sunlit ledge. At this moment, there is a “rainbow” in the shadow immediately under the ledge