Surveying
The cross hairs in the surveying telescope are placed

midway between eye piece and objec-tive lens
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

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Surveying
Refraction correction

adds to the curvature correction
has no effect on curvature correction
partially eliminates curvature correction
completely eliminates curvature correction

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