How Fast Does Light Travel In Fiber Optic Cable?
How Fast Does Light Travel In Fiber Optic Cable? The refractive index of light in a vacuum is one. The refractive index for single-mode fiber can vary slightly based on a number of factors. However, a good estimate is around 1.467, meaning that light travels through fiber at 186,282/1.467 = 124,188 miles per second. How