A method of manufacturing a GaN-based film includes the steps of preparing a composite substrate, the composite substrate including a support substrate in which a coefficient of thermal expansion in its main surface is more than 0. The optical metrology system has a linear optical array including a plurality of optical components. Said resulting powder hydride is then mixed with the other element or compound or a hydride of said other element or compound and the resulting mixture is subjected to intense mechanical grinding until the corresponding nanocomposite is obtained in the form of a hydride. The switching member is capable of outputting an operation force applied thereto in a forward direction and in a reverse direction in a switching manner. The color of flower is pale yellow green with vivid yellow eye.