This invention describes an optical component incorporated in an optical device or subassembly for reducing reflections at the terminal end of an optical fiber. The system according to one embodiment includes an elongate path, a plurality of stations for processing the vehicle, at least two detectors for indicating the presence of the vehicles. A projection luminous flux from one of the projectors is emitted to one of the convex surfaces of the mirror, and that from the other projector to the other convex surface of the mirror.