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

Plumb line
Principal point
Perspective centre
Isocenter

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

All of these
By subtracting their longitudes if places are in the same hemisphere
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

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