What is the application of a colloidal solution of silver bromide in gelatine?

Photography

The correct answer is option 1. Photography.

A colloidal solution of silver bromide in gelatine is primarily used in: Photography

Photography: Silver bromide colloids dispersed in gelatine form the light-sensitive emulsion used in traditional photographic film and paper. When exposed to light, silver bromide undergoes a chemical reaction, resulting in the formation of silver atoms. These silver atoms accumulate to form the visible image on the photographic medium.

Gelatine: Gelatine serves as a binder for the silver bromide particles, providing stability and allowing for even dispersion on the photographic substrate. It also facilitates adhesion to the film or paper base.

Colloidal Solution: The silver bromide particles in the emulsion are colloidal in nature, meaning they are finely dispersed in the gelatine matrix, ensuring uniform sensitivity to light across the photographic medium.

While silver bromide has other potential applications in fields such as medicine (e.g., in certain types of X-ray film), its primary and historically significant use has been in photography.

Therefore, the correct application of a colloidal solution of silver bromide in gelatine is in photography.