Optical bers are used to transmit light over long distances, using the concept of total internal reflection. In this problem, we will learn the basic principle using a simplied model ofan optical fiber. In the diagram below, the 'core' of the fiber, through which light can be transported from one end to the other, has a diameter of d = 100 micrometer and a refractive index of m = 1.5. The core is surrounded by a 'cladding', with a slightly smaller refractive index of nc = 1.45. The optical fiber (core + cladding) is surrounded by air, with a refractive index of na 2 1. The length of the fiber is L = 50 meters. A point source of light is placed very close (at a distance