Naked Science Forum
Non Life Sciences => Technology => Topic started by: charli on 09/06/2021 08:12:11
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Shelley would like to know:
"How do eye glasses change to dark in the sunlight?"
Can you shed some light?
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Hello Shelley!
🙏
& Thanks for your Question.
🤓
Eye glasses that get darker in Sunlight are Photochromic Lenses.
(Popularly known as Transitions Lenses)
I've learnt that these Lenses have a Special coating on their surface.
The special material on the surface reacts with Sunlight by absorbing it & change their shape.
(Darken)
But this process is Reversible.
Once out of direct Sunlight, they retain their previous shape.
(Lighten)
P.S. - i got all the info from Wiki.
https://en.m.wikipedia.org/wiki/Photochromic_lens
😎
(Just began learning Chemistry, hence cannot clarify or further explain chemical changes of molecules & compounds)