\( \text{Directly proportional to the height of terrain} \)
\( \text{Inversely proportional to the focal length of camera lens} \)
\( \text{Directly proportional to the flying height of aircraft} \)
\( \text{Uniform throughout the photograph} \)
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The Correct Option isA
Solution and Explanation
The scale of a vertical aerial photograph of undulating terrain varies with the height of the terrain. For a given flying height above a datum, points at higher elevations will have a larger scale (appear larger on the photograph) compared to points at lower elevations. Thus, the scale is directly proportional to the height of the terrain relative to the datum.