A science communicator is creating a video about the geometry of light paths in optical fibers. They describe a scenario where a light ray enters a fiber at an angle \( heta\) relative to the normal. If the refractive index of the fiber is \(n\), find the angle \(\phi\) of the light ray relative to the fiber's axis after refraction, using Snell's Law, and express \(\cos \phi\) in terms of \( heta\) and \(n\). - Groen Casting