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In page Photography:

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The birth of photography was then concerned with inventing means to capture and keep the image produced by the camera obscura. Albertus Magnus (1193–1280) discovered silver nitrate,[11] and Georg Fabricius (1516–1571) discovered silver chloride,[12] and the techniques described in Ibn al-Haytham's Book of Optics are capable of producing primitive photographs using medieval materials.[citation needed]