Given the task definition and input, reply with output. In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.

One variety of this process transforms current to supercurrent and has a crossed version that requires electrons of different spin to exist at each electrode. The power loss that occurs during this process is the subject of the transfer-matrix. This process can be modeled as a microfacet, as in the Oren-Nayer model which takes masking and shadowing into account. The Phong model of this combines the ambient, diffuse and specular constants into one equation. When this process occurs at a boundary, a wave may change phase depending on the index of refraction. For a flat surface, its namesake angle equals the angle of incidence. For 10 points, name this optical phenomenon whose "total internal" variety can be used to transmit data long distances.
Science