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

    2. A.

     A diamond block
    B.

     Helium-neon gas
    C.

     A ruby rod
    D.

     Carbon dioxide gas

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    Answer : Option C

    Explanation :

    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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