A Reddit user posted a photo of a building reflecting into a dark room. There are no lenses involved, no special effects, just a regular window with regular blinds. So what exactly is going on here?
This effect is known as “Camera Obscura”, and it works when light from an external sources passes through a small opening and projects onto a “screen” inside. National Geographic has a great great video explaining how to make one.
This can be a cool party trick, and really helps with the understanding of how lenses and optics work. So next time you have an empty dark room and want to impress your friends, remember Camera Obscura!
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