Question:
Photographic plates are prepared by coating emulsion of which of the following in gelatin.
Photographic plates are prepared by coating emulsion of which of the following in gelatin.
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Silver bromide \((\mathrm{AgBr})\) is the most commonly used photosensitive material in photography.
Updated On: Jun 15, 2026
- AgBr
- CuBr
- ZnBr\(_2\)
- FeBr\(_2\)
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The Correct Option is A
Solution and Explanation
Step 1: Recall the material used in photographic plates.
Photographic films and plates are prepared using light-sensitive silver halides dispersed in gelatin.
Step 2: Identify the commonly used silver halide.
Among silver halides, silver bromide \((\mathrm{AgBr})\) is highly sensitive to light and is widely used in photographic emulsions.
Step 3: Explain the role of gelatin.
Gelatin acts as a protective colloid and helps in uniformly dispersing \(\mathrm{AgBr}\) particles over the photographic plate or film.
Step 4: Explain the photochemical reaction.
When light falls on \(\mathrm{AgBr}\), it decomposes partially to metallic silver.
\[ \mathrm{AgBr \xrightarrow{light} Ag + \frac12 Br_2} \]
The deposited silver forms the latent image.
Step 5: Eliminate the incorrect options.
\(\mathrm{CuBr}\), \(\mathrm{ZnBr_2}\), and \(\mathrm{FeBr_2}\) are not used because they are not sufficiently photosensitive for photographic purposes.
Step 6: Final conclusion.
Hence, photographic plates are prepared by coating emulsion of
\[ \boxed{\mathrm{AgBr}} \] in gelatin.
Photographic films and plates are prepared using light-sensitive silver halides dispersed in gelatin.
Step 2: Identify the commonly used silver halide.
Among silver halides, silver bromide \((\mathrm{AgBr})\) is highly sensitive to light and is widely used in photographic emulsions.
Step 3: Explain the role of gelatin.
Gelatin acts as a protective colloid and helps in uniformly dispersing \(\mathrm{AgBr}\) particles over the photographic plate or film.
Step 4: Explain the photochemical reaction.
When light falls on \(\mathrm{AgBr}\), it decomposes partially to metallic silver.
\[ \mathrm{AgBr \xrightarrow{light} Ag + \frac12 Br_2} \]
The deposited silver forms the latent image.
Step 5: Eliminate the incorrect options.
\(\mathrm{CuBr}\), \(\mathrm{ZnBr_2}\), and \(\mathrm{FeBr_2}\) are not used because they are not sufficiently photosensitive for photographic purposes.
Step 6: Final conclusion.
Hence, photographic plates are prepared by coating emulsion of
\[ \boxed{\mathrm{AgBr}} \] in gelatin.
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