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

Isocenter
Perspective centre
Principal point
Plumb line

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Surveying
The length of a chain is measured from

outside of one handle to inside of other handle
outside of one handle to outside of other handle
centre of one handle to centre of other handle
inside of one handle to inside of other handle

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