What are the principles and laws of concave lens imaging?

The imaging law of concave lens is: when the object is real, it becomes an upright and reduced virtual image, and the image and the object are on the same side of the lens. Concave lenses have divergent effects on light, so lenses are also called divergent lenses and negative spherical lenses.

Image appearance: concave lens imaging, when it becomes a virtual image, if it is enlarged, it must be produced by convex lens, if it is reduced, it must be produced by concave lens.

Extended data:

The concave lens scatters light, so the object can't become a real image, so the optical path of convex lens measurement method is complicated. At the same time, because of the depth of field, the definition of the image is not easy to distinguish, so the error of measuring the focal length of concave lens is relatively large, but if we want to improve the measurement accuracy on the basis of the original experimental conditions.

It is necessary to improve the above experimental method, because the human eye's own reflection of light intensity is nonlinear, and the limitations of the human eye determine that it is difficult for the human eye to see the accurate imaging position. Therefore, in order to improve the measurement accuracy, it is necessary to avoid subjective judgment based on the clarity of the object directly observed by the human eye.