The process of turning the telescope of a theodolite over its supporting axis through 180? in a vertical plane, is called

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• If altitude bubble is provided both on index frame as well as on telescope of a theodolite, then the instrument is levelled with reference to i) altitude bubble on index frame ii) altitude bubble on index frame if it is to be used as a level iii) altitude bubble on telescope iv) altitude bubble on telescope if it is to be used as a level The correct answer is
• The process of turning the telescope about the vertical axis in horizontal plane is known as
• An axis about which the telescope can be rotated in a horizontal plane, is called
• In modern telescope internal focusing telescope is used.
• Generally, the deflection angle is measured twice, once with the telescope normal and once with the telescope reversed.
• The operation of revolving a plane table about its vertical axis so that all lines on the sheet become parallel to corresponding lines on the ground, is known
• The axis of bubble tube must be perpendicular to the vertical axis.
• The axis of telescope level must be
• The power of a telescope to form distinguishable images of objects separated by small angular distance is called its
• The ratio of the focal length of the objective to that of an eye-piece of a telescope is called its