Surveying Levelling

The observed staff reading is 2.5 m, on a staff which was improperly held at a station such that its slope was 20 : 1. The correct staff reading will be:

1
\(\frac {51}{\sqrt {399}}m\)
2
2.8 m
3
\(\frac {20}{7}m\)
4
\(\frac {50}{\sqrt {401}}m\)

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