斐索流水实验的一种经典解释

Fizeau experiment formula was treated by Einstein as direct evidence to show that light dose not obey velocity superposition principle and it was easily be explained by Lorentz transformation. But special relativity has been challenged ever since it was bore, especially, according to Lorentz transformation, even for medium with small refractive index as air can cause the light in it to move reversely when the medium move towards the light. In this paper, a classical explanation based on velocity superposition principle is proposed, namely light spiral hypothesis that, in the medium reference frame, light propagates along a spiral curve with speed of light in vacuum, and the spiral pitch equals wavelength of the light divided by refractive index of the medium. Because the light speed in medium is calculated along straight line, this hypothesis can explain why its speed in medium is smaller than that in vacuum, it can also explain the Fizeau experiment formula and, when in vacuum, the spiral curve reduced to a straight line. The classical explanation is equivalent to the relativistic one for low medium speed; but for high speed, especially when the speed is towards the light and the refractive index is small, the two explanations are totally different. In this situation, the light in it cannot be reversed in classical explanation, which indicate there exist reasonability valuable enaogh to be investigate by experiments in the future.