Optical lens manufacturer - The relationship between object distance and image distance is exactly the same as that of convex lens. As the object approaches, the image becomes farther and farther, bigger and bigger, and finally becomes a virtual image on the same side. When the object distance increases, the image distance decreases and the image becomes smaller; When the object distance decreases, the image distance increases and the image becomes larger. One time focal length is divided into virtual and real, and two times focal length is divided into size.
