关键词: 周期性, 光信号, 光速, 折射率

Abstract: A new method to measure the speed of light and medium refractive index is presented. While a light propagation distance change cm order of magnitude it can be detected accurately change of propagation time. Using this method, the optical path difference can be detected accurately, if put medium to the light path. Therefore, it is a new method to measure medium refractive index.

Key words: periodicity, light signal, velocity of light, refractive index