![A camera with a focal length of 20 cm fitted in an aircraft is used for taking vertical aerial photographs of a terrain. The average elevation of the terrain is 1200 m above mean sea level](https://www.gkseries.com/blog/wp-content/uploads/2023/08/A-camera-with-a-focal-length-of-20-cm-fitted-in-an-aircraft-is-used-for-taking-vertical-aerial-photographs-of-a-terrain.-The-average-elevation-of-the-terrain-is-1200-m-above-mean-sea-level.jpg)
Q. A camera with a focal length of 20 cm fitted in an aircraft is used for taking vertical aerial photographs of a terrain. The average elevation of the terrain is 1200 m above mean sea level (MSL). What is the height above MSL at which an aircraft must fly in order to get the aerial photographs at a scale of 1:8000?
(A) 2600 m
(B) 2800 m
(C) 3000 m
(D) 3200 m
Ans: 2800 m
Solution:
Given that,
f = 0.2 m
h = 1200 m
![](https://www.gkseries.com/blog/wp-content/uploads/2023/08/Screenshot-459.png)