A proper theory of the propagation of light didn't come until 1865, when the British physicist James Clerk Maxwell succeeded in unifying the partial theories that up to then had been used to describe the forces of electricity and magnetism.

直到 1865 年，英国物理学家詹姆斯·克拉克·麦克斯韦 (James Clerk Maxwell) 才成功地统一了当时用于描述电力和磁力的部分理论，才出现了正确的光传播理论。