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How do photochromatic lenses work?


aommaster

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A very confusing topic to define in a category. How do photochromatic lenses work? You know those glasses that are transpaerent and when exposed to sunlight, they darken? How do they work, from the name, I can guess that it has something to do with light, other thatn that, i have absolutely no idea! How do they work? What chemical do they have in them that makes them behave like this?

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