Physics Uncovered on Instagram: "Fiber optic cables work by using light to transmit information at incredibly high speeds. The core physics behind them is a phenomenon called total internal reflection. Inside a fiber optic cable is a thin glass core surrounded by a material called cladding. Light is sent into the core at just the right angle, and because the core and cladding have different refractive indices, the light bounces down the cable instead of escaping. Even when the cable bends, the l