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1说教材《光和影》是教科版科学五年级上册光单元的第一课,知识体系属于物质世界。《光和影》是本单元的起始课,从本课到第四课将指导学生认识光的传播特点。认识光的传播特点从观察影子开始,因为影子的许多特点,比如说影子总是在背光的一面等现象,显示了光的传播是直线的。五年级的学生对于影子的产生和特点已经积累了不少经验,他们知道影子的产生必须要
1 said the textbook “light and shadow” is the first lesson of the fifth grade of science textbook light unit, the knowledge system belongs to the material world. “Light and Shadow” is the starting lesson of this module, from this lesson to the fourth lesson will guide students to understand the characteristics of light transmission. Knowing the spread of light begins with the observation of shadows, because many of the features of the shadows, such as the fact that shadows are always on the back of the light, show that light is transmitted linearly. Fifth-graders have accumulated a wealth of experience in the production and characterization of shadows, and they know that shadows must be produced