This exercise, presented by the National Nanotechnology Infrastructure Network, covers the concept of waveguides. Students will explore the "angle of incidence, angle of refraction, and how light is transmitted through a waveguide for communication." Students have the option to do this lesson as either a guided or independent inquiry exercise. The lesson is divided into three parts: Refraction tank, Gelatin Waveguide, and Optical Fibers. Student and Teacher guides for each of the three parts are included.