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Camera obscura (from Latin "camera": (vaulted) chamber or room, and "obscura": darkened, plural: camerae obscurae), also referred to as pinhole image, is the natural optical phenomenon that occurs when an image of a scene at the other side of a screen (or for instance a wall) is projected through a small hole in that screen as a reversed and inverted image (left to right and upside down) on a surface opposite to the opening.
The surroundings of the projected image have to be relatively dark for the image to be clear, so many historical camera obscura experiments were performed in dark rooms.
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Camerae obscurae with a lens in the opening have been used since the second half of the 16th century and became popular as an aid for drawing and painting.Light from an external scene passes through the hole and strikes a surface inside, where the scene is reproduced, inverted (thus upside-down) and reversed (left to right), but with color and perspective preserved.The image can be projected onto paper, and can then be traced to produce a highly accurate representation.The location of the bright circle can be measured to tell the time of day and year.In Arab and European cultures its invention was much later attributed to Egyptian astronomer and mathematician Ibn Yunus around 1000 CE.
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This is a remarkably early correct description of the camera obscura; there are no other examples known that are dated before the 11th century.