Quote: when light strikes strongly absorbing organic substances (e.g., rhodopsin), all electrons shift by one double bond; effectively moving an electron the width of the molecule

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[Retinene, the active group of rhodopsin in the cones] has a series of alternate double bonds … blood, and so on. … The alternating series of double bonds is called … When light strikes this molecule, the electron of … shift … and though each one moves only a little … then the effect is the same as though …   Google-1   Google-2

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