Corrector plates are optical devices used in telescopes to improve image quality by reducing optical aberrations. They are typically made of glass and are designed to correct distortions caused by the primary lens or mirror. By adjusting the path of light, corrector plates help produce clearer and more accurate images of celestial objects. These plates are commonly found in Schmidt-Cassegrain telescopes and Maksutov-Cassegrain telescopes, where they play a crucial role in enhancing the performance of the telescope. The use of corrector plates allows astronomers to observe finer details in distant stars, planets, and galaxies, making them essential tools in modern astronomy.