The reflection prisms are usually used for diverging the ray or for changing image location in relation to the subject (rotation, inversion). All the surfaces of the reflection prisms are flat. Reflection surfaces are mirrored, but it is possible, however to make use of Total Internal Reflection (TIR). Besides the Right angle prism, Penta prism, Corner Cube and Dove Prism, UPT also produces many other kinds of Reflection Prism, for examples, the Bauernfeind Prism, Roof Prism, Rhomboid Prism, Abbe-Koenig Prism.