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 × 2 cm and the area of the landscape photographed is 400 km 2 . The focal length of

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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 × 2 cm and the area of the landscape photographed is 400 km 2 . The focal length of the lens in the drone camera is :

TestHub · Accepted Answer

H = 18 km Size of camera film = 2 cm × 2 cm ​ A image ​ = 400 km 2 x = 20 × 1 0 3 m = 2 × 1 0 4 m y = 2 × 1 0 − 2 m y x ​ = 1 0 6 = f 18 Km ​ f = 18 × 1 0 − 3 m = 18 mm f = 1.8 cm ​

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