Surveying
The cross hairs in the surveying telescope are placed

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

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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
level line is normal to plumb line while horizontal line may not be normal to plumb line at the tangent point to level line
both are same

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