Final answer:
The subject of the question is Arts, and it refers to the role of lighting in creating a specific atmosphere or effect in a painting or photograph.
Step-by-step explanation:
The subject of the question is Arts.
Based on the information provided, it seems like the question is referring to the role of lighting in creating a specific atmosphere or effect in a painting or photograph. Lighting is an important element in the visual arts as it can impact the mood, composition, and focus of a piece.
For example, in Edward Hopper's painting 'The Light', the fluorescent light flooding the diner is the main source of illumination, drawing our attention to the people inside. Similarly, early chemist photographers used different techniques and exposure times to capture the effects of light in their images.