Surveying
If the focal length of the object glass is 25 cm and the distance from object glass to the trunnion axis is 15 cm, the additive constant is

1.33
0.1
0.6
0.4

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Surveying
Which of the following errors cannot be eliminated by taking both face observations ?

index error i.e. error due to imperfect adjustment of the vertical circle vernier
None of these
error due to horizontal axis not being perpendicular to the vertical axis
error due to non-parallelism of the axis of telescope level and line of collimation

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