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光是電磁波,也就是變化的電場產生變化的磁場,這個變化的磁場又產生變化的電場,由此光傳播開來. 這兩個場的精確解由麥克斯韋方程組解得,最後得到一個波動方程,有這個波動方程得到的一個結論就是:光速的平方等於磁導率乘以介電常數
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