What is the object distance and image distance of the camera?

The image distance of the camera is the distance from the image formed by the object through the plane mirror to the convex lens, and the object distance is the distance from the object to the convex lens.

A camera is a kind of equipment that uses the principle of optical imaging to form an image and records the image with a negative. It is an optical instrument for photography, which consists of lens, viewfinder, fuselage and other parts. The most common camera takes images of visible light, but not all cameras need visible light (such as infrared thermal imager), and some even don't need traditional light source (such as scanning tunneling microscope). In modern social life, many devices have the characteristics of cameras, such as radar, medical imaging equipment, astronomical observation equipment and so on. The earliest camera structure was very simple, including only a black box, a lens and photosensitive materials. Modern cameras are complex, including lens, aperture, shutter, ranging, framing, photometry, film transmission, counting, self-timer, focusing, zooming and other systems. It is a complex product integrating optics, precision machinery, electronic technology and chemistry.

Before 400 BC, Mozi recorded pinhole imaging in Mo Jing. /kloc-in the 0/3rd century, an image black box made by pinhole imaging principle appeared in Europe. People walked into the black box to watch images or paint landscapes. 1550, the Italian cardano put the lenticular lens in the original pinhole position, and the imaging effect is brighter and clearer than the black box; 1558, the Italian Barbaro added an aperture to the device in cardano, which greatly improved the imaging clarity. 1665, John Zhang, a German monk, designed and made a small portable single-lens reflex camera box, which could only be used for painting because there was no photosensitive material at that time.