What is the law of convex lens imaging? The imaging law of convex lens can be briefly summarized into the following sentences: One-fold focal length divides virtual reality (i.e. objects placed in the focus of convex lens can not be imaged; when the object distance is less than the focal length, it becomes virtual image; when the object distance is larger than the focal length, it becomes real image, that is to say, the focus is the boundary point between the virtual image and the real image of convex lens). Double focal length is fixed.When the object distance is greater than 1 focal length and less than 2 focal length, the image will be inverted and enlarged; when the object distance is greater than 2 focal length, the image will be inverted and reduced; when the object distance is less than 1 focal length, the image will be upright and enlarged.That is to say, the point of demarcation between enlarging or reducing the real image is at 2 times the focal length. Reality is always on the opposite side. (That is, when realizing image, it is always on the opposite side of the image and the object, and the image is on the opposite side of the object.) The imaginary image is always on the same side.(that is, when the image is virtual, it is always on the same side of the image and the object, and the image is upright relative to the object.) The near image and the far image of the object become larger (that is, when the object is near the lens, the image should be far away from the lens, and the image should be larger at the same time). The distant image becomes smaller as the near image.(i.e. when an object is far away from the lens, it is as if it is near the lens and at the same time it is as if it is smaller.) The size of the image is fixed. (that is, when the image distance becomes larger, the image becomes larger and the image becomes smaller when the image distance becomes smaller.) The elephant follows the object.(that is, in which direction an object moves, like in which direction it moves) Rule 1: When the object distance is greater than 2 times the focal length, the image distance is between 1 times the focal length and 2 times the focal length, and the image is inverted and reduced.At this time, the image distance is less than the object distance, the image is smaller than the object, and the object image is on the opposite side.Applications: cameras, cameras. Rule 2: When the object distance is equal to 2 times the focal length, the image distance is also 2 times the focal length, making inverted, large images.At this time, the object distance is equal to the image distance, the image is equal to the size of the object, and the object image is on the opposite side. Rule 3: 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 image is inverted and enlarged.At this time, the image distance is larger than the object distance, the image ratio is larger, and the object image is on the opposite side.Application: Projector, slide projector, film projector. Rule 4: When the object distance is equal to 1 times the focal length, it does not image and emits in parallel light. Rule 5: When the object distance is less than 1 times the focal length, it becomes a positive and enlarged virtual image.At this time, the image distance is larger than the object distance, the image is larger than the object, and the object image is on the same side.Application: Amplification