《彩虹的秘密》一课,第一个实验要用三棱镜做实验。阳光通过三棱镜后,会分散成红、橙、黄、绿、蓝、靛、紫七种色光。认识阳光是由七种色光组成的。我们学校没有三棱镜,怎么办呢?实验不能不做。根据彩虹形成的原理,我想到了吹肥皂泡。这个实验可以用吹肥皂泡代替。叫学生上自然课带上肥 “Rainbow's Secret” lesson, the first experiment to experiment with prisms. After the sun through the prism, will be dispersed into red, orange, yellow, green, blue, indigo, purple seven kinds of color light. Knowing the sun is made up of seven shades of light. Our school does not have a prism, how to do it? Experiment can not do it. According to the principle of rainbow formation, I thought of blowing soap bubbles. This experiment can be used instead of blowing soap bubbles. Ask students to bring fat to the nature class