The surveillance camera is a convex lens.
The working principle of the surveillance camera is based on the imaging law of the convex lens. When the object is outside the double focal length of the convex lens, the convex lens can form an inverted and reduced real image. This imaging feature is the same as the principle of the camera. Therefore, the lens of the surveillance camera is designed as a convex lens to ensure that a clear inverted and reduced real image can be formed when capturing images. This design is not only suitable for surveillance cameras, but also widely used in other occasions that require long-distance, high-definition image capture, such as electronic monitors, traffic monitoring, etc.