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A photograph of a landscape is captured by a drone camera at a height of 18 km. The size of the camera film is 2 cm Γ 2 cm and the area of the landscape photographed is 400 km2. The focal length of the lens in the drone camera is :
(1) 1.8 cm. 2)2.8cm. 3) 2.5cm 4) 0.9 cm
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