起来以后才有了光传播的正确理论。在合并的电磁场中有波动。一米或者更长的是射电波更短的是微波如红外线，紫外线，x射线，跟伽马射线。
in the prediction of the speed of light， british physicist maxwell succeeded in uniting the theory of power and magnetism， and the correct theory of light transmission.there are fluctuations in the consolidated electromagnetic field.a meter or longer is a radio wave that is shorter than a microwave， such as infrared， ultraviolet， x-ray， and gamma rays.m.