Answers related to 'which-is-the-galss-that-darkens-in-sunlight-and-lightens-in-'
Asked by octopus, 09 Oct '11 04:50 pm , 3 answers
Transition lenses are made with photochromic dyes. These dyes react to the sun's UV rays. When the UV rays hit them, the dye reacts and darkens, causi... more
Answered by pradeep singh, 09 Oct '11 04:55 pm
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