Multiple choice

The automatic darkening property of photo chromic glass is due to the presence of

  1. silver iodide

  2. alumina

  3. lead oxide

  4. ferrous oxide
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A Correct answer
Explanation

Photochromic glass contains silver halides (compounds of silver with chlorine, bromine, or iodine) that darken when exposed to UV light. Silver iodide is one such compound that undergoes a reversible chemical reaction, causing the darkening effect. Other options like alumina (aluminum oxide), lead oxide, and ferrous oxide do not have this photochromic property.

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