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In the presence of light, I have read that, structures comprising π conjugated systems like retinol, straighten out from their curled positions, what phenomenon drives this behavior and why does this need to happen? I do understand that for proper π-orbital delocalization in the conjugated system, I would need the p orbitals of all the carbon atoms to be in the same plane, so staying straight would be an assistance, but what I fail to understand is that how does the absorption of light have anything to do with this?

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