Direction: An aircraft flying at an altitude of 5000 m above mean sea level takes aerial photographs of a flat terrain having an average elevation of 1000m above mean sea level. The scale of photographs is 1:20000.
-
The focal length of the camera (in cm) is
-
- 15
- 20
- 25
- 30
Correct Option: B
Focal length of the camera (f)
= flying height (H) × scale
= 5000 × 1/20,000 = 0.25 m = 25 cm
