The 10 mm markings on a levelling staff placed at 20 m are separated by
\(\frac { 1 } { 1000 }\) radian
\(\frac { 1 } { 1500 }\) radian
\(\frac { 1 } { 2000 }\) radian
\(\frac { 1 } { 2500 }\) radian
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Answer : Option C
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