Learn about mirrors and mirror surface processing in this 15-minute lecture from Kyoto University's public course on "Physics and the Universe". Associate Professor Mikio Kurita from the Department of Astronomy, Graduate School of Science at Kyoto University, discusses Chapter 4 of the lecture series focusing on Japan's first segmented telescope - the 3.8m Seimei Telescope. Delivered at the Centennial Clock Tower Memorial Hall on October 21, 2018, explore the technical aspects of telescope mirror construction and processing techniques that make this groundbreaking astronomical instrument possible.