山西省忻州市第一中学高中物理12.6惠更斯原理预习案(无答案)新人教版选修3_4.doc

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1惠更斯原理【教学目标】1通过阅读课本,知道什么是波面和波线,了解惠更斯原理。2通过讨论和分析,了解惠更斯原理对衍射现象的解释。3通过讨论和分析,了解如何用惠更斯原理解释波的反射现象。4通过讨论和分析,了解如何用惠更斯原理解释波的折射现象。【预习任务】一、阅读教材“波面和波线”部分,完成并记忆以下问题:1波面的定义:2波线的定义:3平面波的定义:4球面波的定义:二、阅读教材“惠更斯原理”部分,完成下列任务:1记忆-惠更斯原理的内容:2试理解如何用惠更斯原理解释波的传播。3试理解如何用惠更斯原理解释波的衍射现象。三、阅读教材“波的反射”和“波的折射”部分,完成下列任务。1了解:如何用惠更斯原理解释波的反射现象。2了解:如何用惠更斯原理解释波的折射现象。2【自主检测】1可以想象,对于空间一点发出的球面波,它的波阵面就是以波源为球心的一个个_,而波线就是这些球面的_。如果波面是平面,它就是_波。2介质中任一波面上的各点,都可以看做发射子波的_,其后任意时刻,这些子波在波前进方向的包络面就是新的_。这就是常说的_原理。【组内检查】1波面、波线、平面波、球面波的定义2惠更斯原理的内容

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