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Sodium thiosulphate is added in photography to
Options
(a) improve colour of photograph
(b) remove unreacted AgBr
(c) form latent image
(d) to form a better picture
Correct Answer:
remove unreacted AgBr
Explanation:
AgBr + 2 Na₂S₂O₃ → Na₃ [Ag (S₂O₃)₂] + NaBr
Solution of sodium thiosulphate is used as fixer. It forms a soluble complex with silver halides. After fixing, the film can safely be brought out into daylight.
