History of The Camera Obscura
Camera Obscura (Latin for "dark room") is an optical device that led to photography and the photographic camera.
The Camera Obscura device consists of a box or room with a hole in one side. Light from an external scene passes through the hole and strikes a surface inside, where it is reproduced, inverted (thus upside-down), but with colour and perspective preserved.
The earliest written record of the Camera Obscura is to be found in the writings of Mozi (470 to 390 BC), a Chinese philosopher and the founder of Mohism. Mozi correctly asserted that the image in a Camera Obscura is flipped upside down because light travels in straight lines from its source. As the pinhole is made smaller, the image gets sharper, but the projected image becomes dimmer.