Camera and lens represent convex lens and light screen respectively.

Camera and lens represent convex lens and light screen respectively, because the lens of camera is convex lens, the scene to be shot is object, and the film is light screen.

What is the principle of the camera? The photographer's textbook clearly States that the imaging principle of the camera is one word-pinhole imaging! The aperture controls the amount of light entering through the aperture, and the shutter controls the exposure time through the opening speed. The combination of the two controls the exposure film (film) to record images through the photochemical reaction of silver halide (the main component of photosensitive film). The imaging principle of digital cameras is the same as that of traditional cameras, which refracts the light reflected by objects through the lens.

In order to form an image behind the shutter, the image can be adjusted by adjusting the amount and time of light passing through the lens. COMS (Complementary Metal Oxide Semiconductor) takes the place of film to collect images, and an LCD screen is used to display the collected images to you immediately, while traditional cameras need to develop them to see them, but the imaging principle is the same.