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

6 mm
2 mm
4 mm
10 mm

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Surveying
Homologous points are

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

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