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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

    straighten (something) up or straighten up (something)
    to put something in order, to clean and make something neat
    We had to straighten up the house before inviting my parents for dinner.



    1.
    She ran until she felt a pain in her ________.

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