惠更斯原理的修正

本文对惠更斯原理作出修正，定义一种取向垂直于波阵面的时空偶极子，用它们取代惠更斯原理中波阵面上的点光源，它们只发出向前传播的波，不产生向后传播的波，这就克服了惠更斯原理不加说明地舍弃了子波的向后传播部分的困难。

Correction of the Huygen's principle

The Huygen's principle was corrected by defining a kind of temporal and spatial dipoleorientated to be perpendicular to the wave-front. Used to replace th.e point source on the wave--front inthe Huygen's principle, these dipoles merely, generated the wave transmitted forward, not the wavetransmitted back--ward. Thus, the difficulties that the parts of wavelets transmitted back--ward were abandened without explaination in the Huygen's principle could be overcome.