The law of convex lens imaging is a kind of optical law. In optics, the image formed by the convergence of actual rays and can be presented on the optical screen is called the real image; The image formed by the convergence of the reverse lines of light and cannot be presented on the optical screen is called a virtual image
Convex lens
candle
This article illegal climbing is taken from experience
When the object distance is equal to 2 times the focal length, the image distance is also at 2 times the focal length, forming an inverted and equal large real image. At this time, the object distance is equal to the image distance, the image and the object are equal in size, and the object image is different
When the object distance is less than 2 times the focal length and greater than 1 times the focal length, the image distance is greater than 2 times the focal length, and the inverted and enlarged real image is formed. At this time the image distance is greater than the object distance, the image is larger than the object, and the image is located on the opposite side of the object
When the object distance is equal to 1 times the focal length, there is no imaging, and parallel light is emitted
When the object distance is less than 1 times the focal length, it becomes a upright and enlarged virtual image. At this time, the image distance is greater than the object distance, the image is larger than the object, and the object image is on the same side