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

0.6
0.1
1.33
0.4

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Surveying
Which of the following errors can be eliminated by taking mean of bot face observations ?

error due to line of collimation not being perpendicular to horizontal axis
error due to eccentricity of verniers
error due to imperfect graduations
error due to imperfect adjustment of plate levels

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