Which among the following compound is most commonly used in the Photochromic lenses?

Q. Which among the following compound is most commonly used in the Photochromic lenses?
Answer: Silver Chloride
Notes: Photochromatic or Photochromic glass acquires a darker shade when exposed to bright light and returns to its original lighter shade in dim light. This happens because silver halides (iodide or chloride) is added to this glass

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