Multiple choice

If the focal length (f) of a camera lens is 20 cm and the height of the plane (h) is 1 metres above ground, what will be the scale of the air-photographs ?

  1. 1 : 500

  2. 1 : 5000

  3. 1 : 1

  4. 1 : 50000

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The scale of an air photograph is calculated as the ratio of focal length (f) to flying height (H). Here, f = 20 cm = 0.2 m and H = 1000 m. Scale = 0.2 / 1000 = 1 / 5000.

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