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diopter

n.
1.a unit of measurement of the refractive power of a lens which is equal to the reciprocal of the focal length measured in meters

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    Idiom of the Day

    knock (some) heads together
    to scold some people
    The coach decided to knock some heads together in order to improve the team.



    1.
    Sadbana was the one person (a) / who could, somehow manage (b) / to working in that,,section (c) / for a long time. (d) / No error,(e)

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