在小学自然教材中,涉及到光的色散实验,需要在太阳光下用三棱镜做实验。但农村小学普遍缺乏实验器材,很少有三棱镜;加上上课时容易碰到阴雨天,没有太阳光,就算有太阳光,也不容易照到室内,不便教师演示。针对这些情况,我想了一个简单方法:用投影器射出的强 In primary school textbooks, involving light dispersion experiments, the need to experiment with prisms in sunlight. However, there is a lack of experimental equipment in rural primary schools and few prisms. In addition, it is easy to encounter rainy days and no sunshine in class. Even if there is sunlight, it is not easy to illuminate the interior and inconvenience the teacher's demonstration. In response to these situations, I think of a simple method: strong projection with the projector