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Pinhole lens effect (why you squint your eyes)

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Uploaded on Jun 1, 2011

This small video demonstrates the concept that a pinhole can be used as a small lens. The pinhole allows one to obtain sharper images by decreasing the amount of diverging rays passing by the aperture in favor of the most direct rays.

This effect has been used to create the concept of pinhole camera, spanning back to the 4th century where Aristotle and Euclid wrote on the concept by observing naturally occurring pinholes.

A similar effect can be achieved by squinting your eyes leading to an aperture similar to that of pinholes and therefore allowing a sharper and crisper observation of objects. This is the main reason why most people with affected eye sight are able to improve their vision by squinting their eyes (although another school of thought believes it is due to a deformation of the eye lens caused by the squinting itself).

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