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Question

What was the active medium used in the first working laser ever constructed?

Options:
A .  A diamond block
B .  Helium-neon gas
C .  A ruby rod
D .  Carbon dioxide gas
Answer: Option C
Theodore Maiman built the first working laser using a ruby rod while working at Hughes Research Laboratories in Malibu, California. It lased for the first time on May 16, 1960.

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