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[foh-toh-kem-uh-stree] /ˌfoʊ toʊˈkɛm ə stri/

the branch of that deals with the chemical action of light.
the branch of chemistry concerned with the chemical effects of light and other electromagnetic radiations Also called actinochemistry

photochemistry pho·to·chem·is·try (fō’tō-kěm’ĭ-strē)
The branch of chemistry that deals with the effects of light on chemical systems.
pho’to·chem’i·cal (-ĭ-kəl) adj.
The scientific study of the effects of light and ultraviolet radiation on chemical reactions.


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  • Photochromic

    [foh-tuh-kroh-mik] /ˌfoʊ təˈkroʊ mɪk/ adjective 1. (of chemically treated glass or plastic) capable of darkening or changing color when exposed to light. /ˌfəʊtəʊˈkrəʊmɪk/ adjective 1. (of glass) changing colour with the intensity of incident light, used, for example, in sunglasses that darken as the sunlight becomes brighter

  • Photochromic lens

    photochromic lens pho·to·chro·mic lens (fō’tə-krō’mĭk) n. A light-sensitive eyeglass lens that automatically darkens in sunlight and clears in reduced light.

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