Biology, asked by kajal8740, 10 months ago

what is meant by speed of a photographic film write two units in which the speed of a commonly used film is expressed

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Answered by afreenakbar05

Photographic film is a strip or sheet of transparent plastic film base coated on one side with a gelatin emulsion containing microscopically small light-sensitive silver halide crystals. The sizes and other characteristics of the crystals determine the sensitivity, contrast and resolution of the film.

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