How do camera’s copy images to photographs which we can view on paper? How’s the whole thing work?
Light is focused on to a light sensitive chemical deposited on a thin film. The light is allowed to strike the film surface for a short time by the use of a shutter. The shutter acts as a valve for the light. When light strikes the film, the light sensitive chemical undergoes a chemical change. The amount of light makes a proportional amount of change in the light sensitive material (within limits). Too much light can ‘overexpose’ the film, causing too much of the light sensitive ‘grains’ to change and not leaving enough of them unexposed to make a discernable image. After exposure, the film is chemically treated to ‘develop’ the image. The chemical treatment causes a permanent change in the light sensitive grains, and renders them insensitive to light. It also makes them visible.
October 1st, 2009 at 2:53 am
Light is focused on to a light sensitive chemical deposited on a thin film. The light is allowed to strike the film surface for a short time by the use of a shutter. The shutter acts as a valve for the light. When light strikes the film, the light sensitive chemical undergoes a chemical change. The amount of light makes a proportional amount of change in the light sensitive material (within limits). Too much light can ‘overexpose’ the film, causing too much of the light sensitive ‘grains’ to change and not leaving enough of them unexposed to make a discernable image. After exposure, the film is chemically treated to ‘develop’ the image. The chemical treatment causes a permanent change in the light sensitive grains, and renders them insensitive to light. It also makes them visible.
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