At each interface the spreading wave front is made discontinuous.
在每一分界面上扩展的波前出现间断。
What kind of changes are now spreading in the case of an electromagnetic wave?
但是现在在电磁波的例子中，传播的是哪一类变化呢？
Consider first a light wave spreading out from a point source.
点光源一个好的例子是你家里的电灯泡。
Consider first a light wave spreading out from a point source.
点光源一个好的例子是你家里的电灯泡。
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