Emission theory may refer to:
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Emission theory (relativity), a former competing theory for the special theory of relativity
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Emission theory (vision)
Emission theory or extramission theory (variants: extromission) or extromissionism is the proposal that visual perception is accomplished by eye beams emitted by the eyes. This theory has been replaced by '' intromission theory'' (or ''intromis ...
, a former competing theory for visual perception
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