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

Isocenter
Plumb line
Perspective centre
Principal point

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Surveying
A ’level line’ is a

line parallel to the mean spheriodal surface of earth
line passing through the objective lens and the eye-piece of a dumpy or tilting level
horizontal line
line passing through the center of cross hairs and the center of eye piece

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Surveying
A telescope is said to be inverted if its

vertical circle is to its right and the bubble of the telescope is down
vertical circle is to its left and the bubble of the telescope is up
vertical circle is to its left and the bubble of the telescope is down
vertical circle is to its right and the bubble of the telescope is up

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