Who invented the daguerreotype camera?

• A. Louis Daguerre
• B. William Henry Fox Talbot
• C. Sir John Herschel
• D. Janssen

Answer: (A)

This item tests who created the daguerreotype, the first widely used photographic process. Louis Daguerre developed this method and publicly announced it in 1839. The daguerreotype produced a highly detailed direct positive image on a polished silver-plated copper sheet inside a camera, which was then developed with mercury vapor. It marked a turning point in photography because it offered clear, reproducible images and helped popularize the medium in the 1840s.

The other names are important to photography history for different reasons: William Henry Fox Talbot pioneered the calotype process, which used negatives to produce multiple prints; Sir John Herschel contributed foundational ideas and terminology to the field; Janssen is associated with early camera concepts but not the invention of the daguerreotype.