How does a pinhole camera work? It's quite simple actually.
Light enters through the pinhole sized hole located in some thick aluminum, traveling in a straight line hits the photographic paper within the lightproof box. The image is inverted and is produced upside down on the photographic paper. Because the light is reflecting off the objects outside, the sections that come out black are those that have been exposed to light and the sections that remain white on the photographic paper haven't been exposed to the light.
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