Question

which two types of salts is used in black and white photography?

Answer 1

Silver Chloride(AgCl) and Silver Bromide (AgBr) are the salts which are very commonly used in photography. This is because silver salts (in particular silver halides) are light sensitive compounds. When light falls on these materials, it starts a photochemical reaction (about which you will study in higher grades). Following is the reaction that occurs
Hence metallic Silver is deposited on exposure to sunlight.

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