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refractive index

n.
1.the ratio of the velocity of light in a vacuum to that in a medium

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    Idiom of the Day

    peg away (at something)
    to keep working at something, to keep trying something
    My friend has been pegging away at his job for many years now.



    1.
    When you are going to write an important letter like that, it is absolutely essential that you ________ all the facts first.

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