How do photochromatic lenses work?

Kategorie: Wissen und Wissenschaft
Kanal: BrainStuff
Datum: 12. Februar 2014, 20:44
Stufe: B1-B2 (Mittelstufe)


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Photochromatic lenses darken when exposed to the sun. Discover where these lenses came from, how they work and why they're commonly referred to as "transition" lenses in this episode of BrainStuff.