The imaging law of convex lenses is an optical law. In optics, an image that is formed by the convergence of actual light rays and can be presented on a light screen is called a real image; an image that is formed by the convergence of reverse extension lines of light and cannot be presented on a light screen is called a virtual image. When talking about the difference between real images and virtual images, this method is often mentioned: "Real images are all inverted, while virtual images are all upright."
If it is a thick meniscus concave lens, the situation will be More complex. When the thickness is large enough, it is equivalent to a Galilean telescope. When the thickness is larger, it is equivalent to a positive lens
Its imaging principle is: the object is placed outside the focus and forms an inverted real image on the other side of the convex lens. There are three types of real images: reduction, equal size, and enlargement. The smaller the object distance, the larger the image distance, and the larger the real image. At 2 times the focal length, an inverted real image of equal size will be formed. The object is placed in the focus and forms an upright magnified virtual image on the same side of the convex lens. The larger the object distance, the larger the image distance, and the larger the virtual image. No image will be formed in focus. In optics, the image formed by the convergence of actual light rays is called a real image, which can be captured by a light screen; otherwise, it is called a virtual image, which can only be felt by the eyes. Relative to the original object, the real images are all inverted, while the virtual images are all upright