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The imaginary line passing through the intersection of cross hairs and the optical centre of the objective is known as

The imaginary line passing through the intersection of cross hairs and the optical centre of the objective, is known as

A. line of sight
B. line of collimation
C. axis of the telescope
D. none of these.

35.

A dumpy level was set up at mid-point between pegs A and B, 80 m apart and the staff readings were 1.32 and 1.56. When the level was set up at a point 10 m from A on BA produced, the staff readings obtained at A and B were 1.11 and 1.39. The correct staff reading from this set up at S should be

A. 1.435B. 1.345C. 1.425D. none of these.

May 24 2020 View more View Less

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