Photochromatic glasses before darkening

Photochromatic glasses before darkening

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This image is part of the sequence technology: photochromatic glasses

Credit: LILIFAHRENHEIT/LOOK AT SCIENCES/SCIENCE PHOTO LIBRARY

Caption: Photochromatic glasses before darkening. Photochromatic lenses darken on exposure to ultraviolet (UV) light. The greater the amount of UV light in an environment the darker the lenses become. For the glasses after darkening, see image C022/5362.

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