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Photoelectric effect
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===Image sensors=== [[Video camera tube]]s in the early days of [[television]] used the photoelectric effect. For example, [[Philo Farnsworth]]'s "[[Image dissector]]" used a screen charged by the photoelectric effect to transform an optical image into a scanned electronic signal.<ref name="Ref_x">Burns, R. W. (1998) ''Television: An International History of the Formative Years'', IET, p. 358, {{ISBN|0-85296-914-7}}.</ref>
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