Light enters the core of the optical fiber and strikes the core/cladding interface at an angle Θ. If this angle is
greater than the critical angle (i.e. Θ ≥ Θc where Θc =arcsin(n2/n1)) then the ray will reflect back into the core thus
experiencing total internal reflection. This ray of light will continue to experience total internal reflection as it
encounters core/cladding interfaces while propagating down the fiber.