# Distance a wave travels?

by Evil Bunny
Tags: distance, travels, wave
 Math Emeritus Sci Advisor Thanks PF Gold P: 39,353 Are you saying that you are talking about light traveling for 100 nanoseconds in a medium with refractive index of "1.44"? The refractive index, of some medium through which light can travel, is defined as the ratio of the speed of light in vacuum to its speed in the medium. Here, you are saying that $$\frac{c}{v}= 1.44$$ so that $$v= \frac{c}{1.44}= .6944 c$$