SSC SSC JE Civil 2025 Mock Test Series (Paper 1 & Paper 2) Surveying Photogrammetry

What is the aeroplane flying height to obtain the average scale of the photograph equal to 1/7200? (Ground surface elevations vary from 160 m to 430 m and focal length of the camera lens is 153 mm)

1
1021 m
2
1145 m
3
1284 m
4
1397 m
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