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index of refraction

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

    an open secret
    a secret that so many people know about that it is no longer a secret
    It is an open secret that I will be leaving my company next month.



    1.
    I was standing (a) at the bus stop (b) / waiting for him (c) since eight O'clock. (d) /No error (e)

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    My Account / Test History
    Unit
    Unit : kilometer per hour (km/h)
    Formula :
    in si : 0.277778
    si unit : m/sec
    in cgs : 27.7778
    cgs unit : cm/sec
    Category : speed.      .. More >>
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