Surveying
Homologous points are

Opposite corners of a photograph
Nodal points of the camera lens
Corresponding points on the ground and photograph
Plumb points of stereo pair of photographs

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Surveying
The cross hairs in the surveying telescope are placed

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

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