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  1. Light travels slowest in

  2. A.

     Glass

    B.

     Water

    C.

     Air

    D.

     Vacuum

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    Answer : Option A

    Explanation :

    The indexes of refraction for diamond, air and glass are, respectively, 2.42, 1.00, and approximately 1.50, depending upon the composition of the glass. Light travels slowest in diamond.


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