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Last Updated: Thursday, 23 July 2015 14:34

Written by Dr. Donald H. Mershon

Summary: It used to be a common educational experience for children to build what is called a pinhole camera. Such devices allowed the operator to take reasonably clear photographs (remember film?), without needing a lens. The basis for the camera depended upon the smallness of the pinhole aperture through which light passed, to strike the film. In a similar manner, and because of the same physical principles, the sharpness of one's ordinary vision can be greatly affected by the size of one's pupil.

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