Auxiliary mirrors are additional mirrors used in optical systems, such as telescopes or cameras, to enhance image quality and focus. They help redirect light to the main mirror or lens, improving the overall performance of the device. These mirrors are often smaller and strategically placed to optimize the path of light. In telescopes, auxiliary mirrors can assist in gathering more light and reducing optical aberrations. For example, in the Hubble Space Telescope, an auxiliary mirror helps direct light to the instruments, allowing for clearer images of distant celestial objects.