The imaging law of convex lenses is an optical law. In optics, the image formed by the convergence of actual light rays that can be presented on a screen is called a real image; The image formed by the convergence of the reverse extension lines of light and cannot be presented on the screen is called a virtual image. When discussing the difference between real and virtual images, it is often mentioned that such a distinguishing method is: "Real images are inverted, while virtual images are upright." If it is a thick crescent shaped concave lens, the situation will be more complex. When the thickness is large enough, it is equivalent to a Galileo telescope, and when the thickness is larger, it is also equivalent to a positive lens.
Structure
Convex lens: with thin edges and thick middle, at least one surface must be made into a spherical surface, or both sides can be made into a spherical surface. It can be divided into three types: biconvex, planar convex, and concave convex lenses.
Concave lens: With thick edges and thin middle, at least one surface must be made into a spherical surface, or both sides can be made into a spherical surface. It can be divided into three types: double concave, flat concave, and convex concave lenses.
Convex lenses mainly focus on light.
Concave lenses mainly diverge light.
Imaging properties
Convex lenses are refractive imaging, resulting in images that can be inverted or reduced in size; Inverted, equally large physical images; Inverted and magnified real images; An upright and enlarged virtual image. Concentrate light. A concave lens is a reflection imaging that can only form an upright and reduced virtual image. Divergent effect on light.