The scale of the photography taken from a height of 300 m, with a camera of focal length 15 cm, is
A. 1 : 10,000
B. 1 : 15,000
C. 1 : 20,000
D. 1 : 30,000
Answer: Option C
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Related Questions on Surveying
Which of the following methods of contouring is most suitable for a hilly terrain?
A. Direct method
B. Square method
C. Cross-sections method
D. Tachometric method
A. 750 mm × 900 mm
B. 600 mm × 750 mm
C. 450 mm × 600 mm
D. 300 mm × 450 mm
A. 22° 30'
B. 23° 27'
C. 23° 30'
D. 24° 0'
Correction in qstn height=3000m
Then
Scale=f/h
1/X=(15/100)/3000
X=20000
Scale =1:20,000
I think, answer should be 1:2,000 instead of 1:20,000.
Scale = focal length /Height of photographer from the ground
= 15 cm/300 m
=15cm/300*100cm
= 15/30,000
= 1/2,000
=1:2,000
Scale=f/flying height =15/300,000 =1:20, 000
scale=f/flying ht
=(15/100)/(30*100)
=1:20000
How to get the ans
Hu