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Answers related to 'which-is-the-galss-that-darkens-in-sunlight-and-lightens-in-'

1.

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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