The science behind cameras is very complex for modern cameras, but, if we look at an older camera, we can look at the basics needed to operate a camera. “Reflex cameras, or single-lens reflex cameras, provide an excellent illustration of the fundamental processes of photography. » (Harris, Tom) One of the main components of a camera is the lens. The lens focuses the light rays to create the image. Light rays are made up of small transverse waves. “Cameras use convex lenses to create a real image, which looks exactly like the scene in front of the lens. Convex lenses converge light rays using a phenomenon called refraction. Light travels faster through air than through glass, which is the material of the lens, so the angle becomes smaller when it enters the lens, causing the light rays to converge. (Harris, Tom) As the distance between the lens and the image increases, the light beams spread further. This causes the image size to increase. To save the image, you use film. Say no to plagiarism. Get a tailor-made essay on “Why Violent Video Games Should Not Be Banned”? Get the original essay Film is the chemical part of the camera. “When the film is exposed to an image formed by the lens, it makes a chemical recording of the light. This is done with photosensitive grains, spread on a piece of plastic. These grains react with light, which constitutes the chemical recording. (Harris, Tom) If film is exposed to too much or too little light, the image will become too light or too dark. To prevent this from happening, we need to control the amount of light that enters a lens. To do this, you change the size of the opening. The aperture allows light to pass through to the lens. If you reduce it, less light can reach the lens and the image will not be as bright. Exposure can also be adjusted by changing the shutter speed. Digital cameras are more complicated than that, with many more moving parts and electrical components. Cameras, like security cameras, and others allow us to capture video and images. Security cameras allow us to capture images of criminals, catch them and arrest them much more easily. This is a good thing, because as a result we have less crime. “Cameras are also used in medicine, to be able to see inside the body, without resorting to surgery or large cuts in the body. These cameras can show many problems in the body, including identifying cancers or other such medical problems. (AG, Basel) Cameras have many real-world uses that make people's work and lives easier. But they also have negative effects. “Cameras, like SLRs that use film, are bad for the environment. They use many chemicals each time the film is developed, and these chemicals cannot be used again. These chemicals end up in landfills or are dumped into rivers and the environment. (Adams, Mike)Also, camera housing production is bad for the environment because these cameras are made of plastic, which is made of petroleum and cannot decompose. When people are done with the camera, they just throw it in the trash, and it ends up staying there. “Digital cameras have a much lower environmental impact than digital cameras...