Scoreboard gun aiming manufacturer - Imaging law of convex lens
The imaging law of convex lens is an optical law. In optics, the image formed by the convergence of real light and presented on the light screen is called real image; The image which is formed by the convergence of the reverse extension line of light and cannot be displayed on the light screen is called virtual image. When talking about the difference between the real image and the virtual image, we often mention such a method: "the real image is inverted, while the virtual image is upright."
If it is a thick meniscus concave lens, the situation will be more complicated. When the thickness is large enough, it is equivalent to Galileo telescope, and when the thickness is larger, it will be equivalent to positive lens.
