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Discussion :: UPSC Civil Service Exam Questions

  1. An imaginary line passing through the optical centre of the objective and the optical centre of the eye-piece in the telescope of a surveying instrument is called the

    2. A.
    horizontal axis
    B.
    line of collimation
    C.
    optical axis of the telescope
    D.
    reference axis

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    Workspace

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    Answer : Option B

    Explanation :

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