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

Perspective centre
Isocenter
Principal point
Plumb line

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

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

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