文档介绍：三、球面波和柱面波（略）
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四、光波的辐射和辐射能
光是电磁波，光源发光是物体辐射电磁波的过程。物体微观上可认为由大量分子、原子、电子所组成，可看成电荷体系，大部分物体发光属于原子发光类型。
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入射面振动的分量为光矢量的p分量，记为EP。
称垂直于入射面振动的分量为光矢量的s分量，记为ES。
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反射定律和折射定律（电磁场连续条件）
（斯涅耳定律）
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