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The retina of a human eye can detect light when radiant energy incident on it is at least 4.001017, For light of 673 mm wavelength,

The retina of a human eye can detect light when radiant energy incident on it is at least 4.001017, For light of 673 mm wavelength, how many phetens does this comrespond to? He sure your answer has the correct number of significant digits. photons

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