八年级物理上册第四章第四节《光的折射》说课课件(新版)新人教版.ppt

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1、光的折射,讲课部分结束,说课部分,教材中的地位作用,教 材 分 析,学 情 分 析,教学目标,学 情 分 析,教学重难点,学 情 分 析,说教法学法,教 法 与 学 法,教 学 程 序 设 计,瞄准了,插不中?,情景 创设,你能把鱼插中吗?,认识 现象,实验 探究,规律 应用,小结 思考,情景 创设,认识 现象,实验 探究,规律 应用,小结 思考,情景 创设,认识 现象,实验 探究,规律 应用,小结 思考,光从一种介质斜射入到另一介质时,传播方向发生偏折的现象,叫做光的折射。,空气,玻璃,N,N,A,O,B,i:,入射光线和法线的夹角入射角,r:,折射光线和法线的夹角折射角,情景 创设,认识

2、现象,实验 探究,规律 应用,小结 思考,情景 创设,认识 现象,实验 探究,规律 应用,小结 思考,情景 创设,认识 现象,实验 探究,规律 应用,小结 思考,情景 创设,认识 现象,实验 探究,规律 应用,小结 思考,再次看到硬币,情景 创设,认识 现象,实验 探究,规律 应用,小结 思考,重点总结光的折射规律部分,情景 创设,认识 现象,实验 探究,规律 应用,小结 思考,回顾本节课所学内容,生活中还有哪些现象与光的 折射有关呢?,想一想,海市蜃楼,情景 创设,认识 现象,实验 探究,规律 应用,小结 思考,第四节 光的折射,空气,水(其他介质),一、光的折射:光从一种介质斜射入另一种介质时, 传播方向发生偏折。,二、探究光的折射规律:,1、折射角与入射角的关系,结论:当光从空气斜射入水中或其他介质中时,折射光线 向法线方向偏折。,2、光路是否可逆,结论:光路是可逆的。,三、应用:硬币上升、池水变浅等,板书设计,板书设计,

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