homework help? why was photography invented in the 1920s and 1930s when the camera obscura had been known for centuries?


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Call me Z Profile
Call me Z answered

It was actually the 1820's and 1830's that the earliest photographic processes were demonstrated to the public. This became possible at that time due to new advances in chemistry that allowed for still images to be captured and preserved on stationary media, like glass and metal, using various compounds of silver. 

Photographic film was first produced by George Eastman, later of Eastman Kodak, in the 1880's, which led to the wide proliferation of photography, and eventually the birth of moving pictures, in the early 20th century. 

PJ Stein Profile
PJ Stein answered

I don't know where you are getting the 1920s and 1930s from. Modern photography was actually developed in 1884 by George Eastman. His company than refined the process so that it could be mass marketed in 1901. And the reason for it was to make the process not only easier, but safer and more reliable. Prior to Eastman's advances it was an expensive and complex process. Eastman made it so anyone can take a photo.

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