Which one of the following compounds is used in 'black and white' phot

Which one of the following compounds is used in ‘black and white’ photography ?

AgF

AgBr

AgCl

Ag₂SO₄

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This question was previously asked in

UPSC NDA-2 – 2021

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Silver halides are widely used in ‘black and white’ photography due to their sensitivity to light. When light strikes a silver halide crystal, it initiates a chemical change that can later be developed into a visible image. Silver bromide (AgBr) is the most common silver halide used in photographic films, although silver chloride (AgCl) and silver iodide (AgI) are also used, particularly in photographic papers. Among the options provided, AgBr is a standard compound used in black and white photography.

– Silver halides are photosensitive compounds.
– AgBr is widely used in photographic films.

The photographic process involves exposing the silver halide crystals on film or paper to light, creating a latent image. This image is then developed using chemical solutions which convert the exposed silver halide into metallic silver (appearing black). Unexposed silver halide is removed during fixing.

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