Surveying
23 cm × 23 cm photographs are taken from a flying height with a camera of focal length of 3600 m and 15.23 cm respectively. A parallax difference of 0.01 mm represents

4 m
3 m
2 m
1 m

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Surveying
The cross hairs in the surveying telescope are placed

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
much closer to the objective lens than to the eye piece

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