It was a Physicist called James Clerk Maxwell who discovered that these are two aspects of the same thing and derived the wonderfully elegant rules of electromagnetism and theorized that light was an electromagnetic wave.

一位名叫詹姆斯克拉克麦克斯韦的物理学家发现了这是同一事物的两个方面，并推导出极其优雅的电磁学规则，并提出光是一种电磁波的理论。