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Question
Which of the following errors can be eliminated by reciprocal measurements in differential leveling?
I. Error due to earth curvature
II. Error due to atmospheric refraction
cgqjksi.k rys{k.k esa ikjLifjd eku विधि }kjk dkSu lh =kqfV;k¡ nwj dh tk ldrh gS-
I. i`Foh dh oØrk }kjk gksus okyh =qfV
II. i`Foh ds orZu }kjk gksus okyh =qfV
A.
Both I and II
B.
I only
C.
II only 
D.
Neither I nor II
Answer ( Option A)

Both I and II

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