Surveying
The foot of the perpendicular on the picture plane through the optical centre of the camera lens, is known as

Perspective centre
Isocenter
Plumb line
Principal point

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Surveying
Pick up the correct statement from the following. The difference between the longitudes of the places is obtained.

By adding their longitudes if places are in the different hemispheres
By subtracting the sum of their longitudes exceeding 180° from 360° if places are in different hemispheres
By subtracting their longitudes if places are in the same hemisphere
All of these

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