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optic axis

n.
1.a line that passes through the center of curvature of a lens so that light is neither reflected nor refracted

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    Idiom of the Day

    skin-deep
    only on the surface, having no deep or honest meaning
    Although beauty may be only skin-deep many people care about it very much.



    1.
    If you have a lot of work to do, you are as busy as a ________

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    Unit
    Unit : square kilometer (km2)
    Formula : km*km
    in si : 1.00E+06
    si unit : m2
    in cgs : 1.00E+10
    cgs unit : cm2
    Category : area.      .. More >>
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