Surveying
If the image of a triangulation station of R.L. 500 m is 4 cm from the principal point of a vertical photo taken from an altitude of 2000 m, above datum, the height displacement will be

10 mm
4 mm
6 mm
2 mm

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Surveying
Homologous points are

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

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