Surveying
The cross hairs in the surveying telescope are placed

much closer to the eye-piece than to the objective lens
anywhere between eye-piece and objective lens
much closer to the objective lens than to the eye piece
midway between eye piece and objec-tive lens

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Surveying
A ’level line’ is a

line passing through the center of cross hairs and the center of eye piece
line passing through the objective lens and the eye-piece of a dumpy or tilting level
line parallel to the mean spheriodal surface of earth
horizontal line

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Surveying
The difference between a level line and a horizontal line is that

horizontal line is normal to plumb line while level line may not be normal to the plumb line
level line is a curved line while hori-zontal line is a straight line
both are same
level line is normal to plumb line while horizontal line may not be normal to plumb line at the tangent point to level line

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