Surveying
In a truly vertical photograph,

Plumb point coincides the principal point
All listed here
Principal point coincides the isocenter
Iso-centre coincides the plumb point

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

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