Lecture 60 Fiber Optics: How Fiber Works

Ever wondered why fiber optic cables can bend light around corners or why diamonds sparkle so brilliantly? The secret lies in a phenomenon called total internal reflection—a dazzling optical trick where light, instead of escaping a surface, gets trapped and reflected entirely inside. This happens when light travels from a denser medium (like water or glass) to a less dense one (like air) at a steep enough angle. If the angle is beyond a critical point, rather than passing through, the light refl