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Take one thousand glass rods (each one a thousandths of an inch in diameter), coat them with a substance of refractive index less than that of the glass rods, wind these in such a way as to keep orientation of the fibers constant, and a rope will be made that faithfully conducts an image around corners. How is the bending of light possible? The answer lies in a new development called Fiber Optics.
Fiber Optics depends on the laws of internal reflection. Internal reflection will be complete when the angle of incidence exceeds the critical angle. As the angle of incidence is decreased, a ray will be made which will not pass out of the media, but will form an angle with the normal of 90.° This angle of incidence is called the critical angle. If a still smaller angle of incidence is created, the light will pass out of
Reinecke RD. Through a Rope—Around a Corner. Arch Ophthalmol. 1961;65(2):162. doi:10.1001/archopht.1961.01840020164002