Photography is based on the nature of silver halides. Except AgF, the silver halides are photosensitive. These undergo decomposition in light and turn black due to formation of free silver.
`2AgBroverset(light)to2Ag+Br_2`
The photography films are prepared by adding `20%` aqueous solution of `AgNO_3` to `NH_4Br` solution containing gelatic. When such a film is exposed, emulsion gets affected and a latent image is formed on the film.
When this exposed film or plate is dipped ina developer which contains a reducing agent, the part affected most during exposure are reduced to the maximum. The image becomes visible. It is called a negative. The remaining sensitive emulsion on the negative is removed by dissolving it in hypo solution (fixer). Fihnally, a positive of the nagative already prepared is made on silver bromide paper.
Q. The solution of the developer consists of

Options

A. Alkaline solution of pyrogallol
B. Alkaline solution of quinil
C. Either (a) or (b)
D. Neither (a) nor (b)

Answer

To determine the solution of the developer used in photography, we need to analyze the information provided in the question and the video transcript.

### Step-by-Step Solution:

1. **Understanding the Developer's Role**: The developer is a solution used in photography to convert the latent image on the film into a visible image. It contains reducing agents that reduce the exposed silver halides to metallic silver.

2. **Identifying Components of the Developer**: According to the transcript, the developer consists of alkaline solutions. Specifically, it mentions two potential components: alkaline solution of pyrogallol and alkaline solution of quinol.

3. **Analyzing Pyrogallol and Quinol**:
- **Pyrogallol**: This is a known photographic developer. It acts as a reducing agent and is often used in alkaline solutions to develop photographic films.
- **Quinol**: Also known as hydroquinone, it is another common developer used in photography. It also works effectively in alkaline conditions.

4. **Conclusion on the Developer's Composition**: Since both pyrogallol and quinol are recognized as effective reducing agents in alkaline solutions for photographic development, the developer solution can consist of either or both.

5. **Final Answer**: Therefore, the solution of the developer consists of either an alkaline solution of pyrogallol, an alkaline solution of quinol, or both.