Surveying
If v, t and f/H are the ground speed of the aircraft, the shutter speed of the camera and the scale of the photograph respectively, then the amount of image displacement

i = t. H/v. f
i = v. f/t. H
i = v. t. (f/H)
i = v. t. H/f

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Surveying
For a line AB

the forebearing of AB and back bearing of BA differ by 180°
both (A) and (B) are correct
none is correct
the forebearing of AB and back bearing of AB differ by 180°

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