Mo Jing is a work of geometric optics, also known as Mozi, which contains a lot of knowledge of mechanics, optics and geometry, and is an important part of Mozi. The book consists of four parts: Shang Jing, Shang Jing, Xia Jing and Xia Jing, and records the scientific achievements in the pre-Qin period.
Mo Jing is an important part of Mozi, which was completed in Guisi in 14 (388 BC). Mo Jing consists of four chapters: classic, classic, classic and classic (including six chapters of Daqu and Xiaoqu). Jing Shuo is an explanation or supplement to Jing Shuo.
Others think that the classics were written by Mo Zhai, the founder of Mohism, and recorded by his disciples. Logic accounts for the largest proportion in Mo Jing's content, followed by natural science, with more than 10 in geometry and about 20 in physics, mainly including mechanics and geometric optics.
Mo Jing has eight articles on geometrical optics:
There are eight articles on geometrical optics in the Book of Mohism, which explain the imaging of shadow, pinhole, plane mirror, concave mirror and convex mirror, and also explain the relationship between focal length and object imaging, which is more than 100 years earlier than the optical records recorded by Euclid in ancient Greece (about 330 ~ 275 BC).
The theory of mechanics is also a masterpiece of ancient mechanics. The definition of force, lever, pulley, shaft, slope, fluctuation, balance and center of gravity of objects are all discussed. Most of these arguments come from practice.