Photochromatic sunglasses

Photochromatic sunglasses

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This image is part of the sequence technology: photochromatic sunglasses

Credit: MARTYN F. CHILLMAID/SCIENCE PHOTO LIBRARY

Caption: Photochromatic sunglasses in bright conditions. Photochromatic lenses darken on exposure to ultraviolet (UV) light. The greater the amount of UV light in an environment the darker the lenses become.

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Keywords: beach, beach towel, bright sunlight, chemistry, dark, darkened, glasses, lens, lenses, light sensitive, low light, photochangeable, photochemical, photochromic, photoreactive, physical, physics, reaction, reversible photochemical reaction, sand, sandy, spectacles, sunglasses, sunlight, technological, technology, tint, tinted, transition, transitions

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