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Question
In plane surveying where a graduated staff is observed either with horizontal line of sight or inclined line of sight, the effect of refraction is to
A.
Increase the staff reading
B.
Decrease the staff reading
C.
Neither increase nor decrease the staff reading
D.
Duplicate the staff reading
Answer ( Option B)

Decrease the staff reading

Solution

Due to earth refraction, line of sight bends towards the earth, therefore we noted less value of staff reading i.e. Decrease in staff reading.
 
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