“光的直线传播”是几何光学的基础,由此可引入几何光学的两个基本定律——光的反射定律和折射定律.所以,在初中阶段,学生学习光的有关知识、认识光现象时,首先要建立“光在均匀介质中沿直线传播”的概念.这节课看似简单、意义却重大,教学中存在哪些问题,在课程改革的新形式下又应注意哪些问题呢?一、光线概念的理解与应用光线实际上是不存在的,用光线来表示光的传播路线和方向,是一种物理模型化思想,这种物理思想对 The “light of linear transmission” is the basis of geometric optics, which can be introduced into the two basic laws of geometric optics - the law of light reflection and refraction, so in the junior high school, students learn the light of knowledge, understanding of light , First of all to establish the concept of “light in a homogeneous medium along a straight line.” This lesson may seem simple, but significant, what are the problems in teaching, curriculum reform in the new form should pay attention to what issues? First, The concept of light and understanding of the application of light is actually non-existent, the light used to express the light of the transmission line and direction, is a physical model of thinking, this kind of physical thinking