Who theorized the 'dark chamber' concept and the early camera obscura idea?

• A. Aristotle
• B. Alhazen
• C. Michelangelo
• D. Thaumatrope

Answer: (A)

The main idea here is the basic setup of the camera obscura—the use of a dark space with a small opening to form an image from the outside world on the opposite surface. Aristotle is the best fit because he described how light entering through a tiny hole in a dark chamber can project an inverted image on the wall across from it. This is the earliest known articulation of the dark-chamber idea that underpins the camera obscura.

Alhazen later expanded on optics and gave a more rigorous, mathematical treatment of how light travels and forms images, but the initial concept of projecting an outside scene through a small aperture in a dark space traces back to Aristotle. The other options don’t fit: Michelangelo was an artist who could have used such a device, Thaumatrope is a 19th-century optical toy, and Alhazen, while pivotal to optics, is not the earliest theorist of the dark chamber concept.