Which one of the following types of glass can cut off ultraviolet rays?
Reviewed by Dalvoy
UPSC Civil Services preparation
- ASoda glass
- BPyrex glass
- CJena glass
- DCrookes glassCorrect
Explanation
Crookes glass is the correct answer because it contains cerium oxide. Cerium oxide has the specific chemical property of absorbing and blocking harmful ultraviolet rays while remaining transparent to visible light. This makes it the standard material used in the manufacturing of high quality sunglasses and protective eyewear to shield eyes from sun damage. Other types of glass like soda or pyrex allow most ultraviolet light to pass through.
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