What does multiplier mean? What does multiplier mean?

About the meaning of magnification, the explanation of computer terms

The magnification of the lens can be seen from the focal length (in millimeters). The magnification of the lens will affect the size of the scene on the image. The viewing angle of a long focal length lens (with a large focal length, such as 85 mm, 150 mm, 200 mm) is narrower than that of a short focal length lens. It is very important that the larger the telephoto lens is, the closer the distant scene will be. This is the case with natural and wild objects, for example. Short focal length lenses (wide viewing angle), such as 28 mm and 35 mm, have a wider viewing angle and can accommodate more scenes, which is very useful in small-scale photography.