What is the correction for refraction as applied to staff reading (whe – McqOptions

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1.	What is the correction for refraction as applied to staff reading (where R is radius of earth)?
A.	d2/2R
B.	1/7 ×(d2/2R)
C.	6/7 × (d 2/2R)
D.	1/7×(d2/R)
Answer» C. 6/7 × (d 2/2R)

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