. What was the active medium used in the first working laser ever constructed? Options: A . &nbspA diamond block B . &nbspHelium-neon gas C . &nbspA ruby rod D . &nbspCarbon dioxide gas

. What was the active medium used in the first working laser ever construct

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

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