21. This is caused by multiple internal reflections in the thin film, scattering the emitted light. 22. Prisms are sometimes used for the internal reflection at the surfaces rather than for dispersion. 23. Similarly, phonons are also capable of producing evanescent waves in a total internal reflection geometry. 24. In the case of total internal reflection , and are complex numbers representing the evanescent wave. 25. This incompatibility is analogous to the lack of transmission that occurs during total internal reflection . 26. The fibers of ulexite act as optical fibers, transmitting light along their lengths by internal reflection . 27. The net effect of the internal reflections is to flip the image both vertically and horizontally. 28. Such devices can be based on the Faraday effect, on birefringence, or on total internal reflection . 29. Acrylic rod, illustrating the total internal reflection of light in a multi-mode optical fiber . ]] 30. This phenomenon is known as total internal reflection .
