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Photochemistry is the study of the interaction of light and chemicals.

Balzani's first law of photochemistry is: "For a photochemical reaction to exist, the chemical in question must absorb light at the frequency used for irradiation." For example, green grass is green because chlorophyll (an Organometallic complex) absorbs other types of light but reflects green.

If you try to grow plants under green light (460nm to 600nm) - they will reflect it all and not be able to photosynthesise.

Photochemists use techniques such as: