Question

The colourless coating on a photographic film contains a chemical substance which reacts upon exposure to light, causing the film to darken. Which of the following substances is present in the darkened parts of the film?

A. Bromine

C. Silver

B. Carbon

D. Silver bromide​

Answer 1

D. Silver bromide​

Step-by-step explanation:

Silver bromide (AgBr) is used in photographic films because silver bromide is light sensitive.

Silver bromide (AgBr) is a colorless coating on a photographic film that decomposes and converted to elemental silver when exposed to the light and causes the film to darken.

Hence, the correct answer is "D. Silver bromide​".