Civil Engineering MCQAE Level Civil Engineering
Which of the following about long levelling sights is correct?
SurveyingCurvature and RefractionMEDIUM
Choose the correct answer
A
curvature raises the line of sight relative to level surface
B
refraction doubles curvature error in the same direction
C
curvature correction is negative while refraction partly offsets it
D
both corrections are always zero
Correct Answer
C. curvature correction is negative while refraction partly offsets it
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Curvature/refraction corrections matter for long sights. Correct option: C.
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