The Physics Behind Fiber Optic Internet

Your internet is basically light trapped inside a tiny glass tube. For it to work,

the light has to enter at the perfect angle, or it all fails. These old physics

notes from 2012 show the secret sauce. It's all about the "acceptance angle."

Think of it as a tiny, invisible doorway for light. If a light ray hits

the fiber outside this specific angle, it just bounces off and gets lost. The notes also talk

about "numerical aperture," which is basically a rating for how wide that doorway is.

A higher number means the fiber can grab more light from more angles. It's all a delicate

balance of physics, ensuring light stays trapped and travels for miles. So yeah,