Q: Which one of the following components is added to optical glass to cut off UV rays?
(a)Copper oxide
(b)Cerium oxide
(c)Manganese oxide
(d)Cobalt oxide
Correct Answer: (b)
The correct answer is (b): Cerium oxide. Subject: Geography | Sub-topic: Economic & Mineral Geography Note: This answer was determined through AI-based research. Verify against the official answer key when available.