A method to improve light extraction efficiency of a light emitting element such as an electroluminescent element is disclosed. A second cheek portion 8 is connected to the first 5 so as to be displaceable between first and second positions, and has a rein coupling portion 10. With respect to a business function specified by the user, an associated physical model is analyzed, and subgraphs associated with the business function are calculated and displayed. Once collected, the two sets of image data are used to generate orientation information related to the reflector.