Question

when photocromatic lenses exposed to light they become coloured but taken away from sunlight colour disappers give reasons and also write chemical reaction involved​

Answer 1

Answer:

Plastic photochromic lenses use organic photochromic molecules (for example oxazines and naphthopyrans) to achieve the reversible darkening effect. These lenses darken when exposed to ultraviolet light of the intensity present in sunlight, but not in artificial light.