Which mechanism explains photochromism when ultraviolet radiation strikes spiropyran molecules within lens material?

💡 Explanation

When UV radiation strikes spiropyran, bond cleavage between carbon and oxygen atoms occurs because absorbed energy overcomes the bond energy, inducing rearrangement into merocyanine form. Therefore bond cleavage and rearrangement causes color change, rather than excitation transfer, thermal vibration, or polymerization, requiring different mechanisms.

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