The Pinhole Principle

The Pinhole Principle
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A pinhole camera, also known as camera obscura, or "dark chamber", is a simple optical imaging device in the shape of a closed box or chamber. In one of its sides is a small hole. Light entering through the hole forms an image of the scene outside on the opposite wall. The image is upside down and backwards. This "magic" is explained by a simple law of the physical world. Light travels in a straight lines.