By: Mr. God

Mr. God — Thu, 01 Oct 2009 07:53:59 +0000

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.
References :
My fantastic brain

Comments on: Can someone explain how photographs work? How they get images on paper?

By: Mr. God