The Camera Obscura, Relic of the Golden Era
source: http://baghdadbythebaysf.com/2011/05/the-camera-obscura-relic-of-the-golden-era/
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- Eric_Kauschen
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Go into a very dark room on a bright day. Make a small hole in a window cover and look at the opposite wall. What do you see? Magic! There in full color and movement will be the world outside the window — upside down! This magic is explained by a simple law of the physical world. Light travels in a straight line and when some of the rays reflected from a bright subject pass through a small hole in thin material they do not scatter but cross and reform as an upside down image on a flat surface held parallel to the hole. This law of optics was known in ancient times.
