The chemical reaction in photochromatic lens
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Glass photochromic lenses contain silver halide crystals embedded in a glass substrate. ... When a photochromic dye is exposed to UV radiation, a chemical bond is broken. The molecule then rearranges into a species that absorbs at longer wavelengths in the visible region, causing the lensto darken.
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Early photochromic glasses were usually made of glass and contained small crystals of silver halides that darkened when exposed to light, just like old photographic films
Early photochromic glasses were usually made of glass and contained small crystals of silver halides that darkened when exposed to light, just like old photographic films
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