Figure P.4.82 shows a prism-coupler arrangement developed al the Bell Telephone Laboratori...

Figure P.4.82 shows a prism-coupler arrangement developed al the Bell Telephone Laboratories. Its function is to feed a laserbeam into a thin (0.00001-inch) transparent film, which then serves as a sort of waveguide. One application is that of thin-film laserbeam circuitry—a kind of integrated optics. How do you think it works?

Figure P.4.82