Civil Engineering - UPSC Civil Service Exam Questions - Discussion
Discussion Forum : UPSC Civil Service Exam Questions - Section 2 (Q.No. 5)
5.
A 3000 m long line lying at an elevation of 450 m measures 10 cm on a vertical photograph.
The focal length of the camera is 21 cm. The scale of the photograph for the area having an elevation of 1000 m will be
The focal length of the camera is 21 cm. The scale of the photograph for the area having an elevation of 1000 m will be
Discussion:
5 comments Page 1 of 1.
Hamza Manzoor said:
2 years ago
Scale = 10/(3000 *100) = 1/30000.
Now,
1/30000 = 0.21/(H - 450).
You get flying height, H = 6750m.
For 2nd case.
Scale = f/(H - h).
Scale = 0.21/(6750 - 1000) = 1 in 27381.
Now,
1/30000 = 0.21/(H - 450).
You get flying height, H = 6750m.
For 2nd case.
Scale = f/(H - h).
Scale = 0.21/(6750 - 1000) = 1 in 27381.
(4)
Rashid Shahab said:
5 years ago
For 1st case.
Scale = 10/(3000 *100) = 1/30000.
Now,
1/30000 = 0.21/(H - 450).
You get flying height, H = 6750m.
For 2nd case.
Scale = f/(H - h).
Scale = 0.21/(6750 - 1000) = 1 in 27381.
Scale = 10/(3000 *100) = 1/30000.
Now,
1/30000 = 0.21/(H - 450).
You get flying height, H = 6750m.
For 2nd case.
Scale = f/(H - h).
Scale = 0.21/(6750 - 1000) = 1 in 27381.
(4)
Manish k soni said:
7 years ago
Give an explanation of the solution.
(1)
Sam said:
7 years ago
Here, S = f/(H-h).
(1)
Patel bhai said:
7 years ago
Please give the explanation.
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