effect of light on films
The effect of light on films is amplified chemically. The image is formed by a plastic strip coated with a light-sensitive material called the emulsion. It is actually a suspension of tiny grains of a silver compound in gelatin. The emulsion is microscopically thin but the silver halides within it are too small to be seen even by the ordinary microscope. Consequently they are suspended at various depths within the emulsion and can overlap. It is the silver halide grains that are light-sensitive and the gelatin is simply a binder. Light reflected from the subject is picked up by the camera lens and projected to form an image on the film. The image consists of various densities of light representing the darker and lighter parts of the subject.
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