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Pin-hole camera experiment. An object is being viewed with a lamp and a piece of paper with a pin hole in it. The image seen is upside down (upper right). This is because the way the light passes through the pin hole results in an inverted image reaching the observer's eye. This illustration, part of a section titled 'Experiences de Physique sans Appareils' (illustrating popular physics experiments that don't require the use of laboratory equipment), is from 'Physique Populaire' (Emile Desbeaux, 1891).
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