Surveying
The relief displacement of a building 72 m high on photograph is 7.2 mm and its top appears 10 cm away from principal point. The flying height of the camera, is

1500 m
2000 m
500 m
1000 m

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Surveying
Homologous points are

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

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