The relief displacement of a building 72 m high on photograph is 7.2 mm and its top appears 10 cm away from principal point. The flying height of the camera, is
A. 500 m
B. 1000 m
C. 1500 m
D. 2000 m
Answer: Option B
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Building ht. 72m
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Flying ht = (72m/7.2 mm)*10cm=1000m