Surveying
For plane ground the scale of a vertical photograph will be same as that of a tiled photograph along the photo parallel through

Principal point
Isocenter
None of these
Plumb point

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Surveying
A ’level line’ is a

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

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