A Camera
A camera is quite a wonderful instrument for taking pictures. As light enters through the shutter it leaves an image on the film. An ordinary camera is constructed in the form of a box . Like the human eye it has two compartments, the lens in the front and the film or plate at the back. The convex lens is covered by a shutter. When we press a small button the shutter opens instantaneously and lets in a ray of light. This light which is actually reflected from the object that we want to photograph, leave a picture on the sensitive surface of the film. Then this film is developed in a dark room and prints are made from the negative.
