The correction for refraction as applied to staff reading is 1 d? (a) + 1 d (b) 7 2R 2R (c) + R (d) 7 R where Ris radius of earth.

Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
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The correction for refraction as applied to staff
reading is
d?
(a) +
1 d2
(b)
7 2R
2R
(c) +
R
(d)
7 R
where Ris radius of earth.
Transcribed Image Text:The correction for refraction as applied to staff reading is d? (a) + 1 d2 (b) 7 2R 2R (c) + R (d) 7 R where Ris radius of earth.
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