Cameroon Baccalauréat Série F4

Practice session

In optical leveling (nivellement direct / géométrique), a level instrument is setup between Benchmark point $A$ (known elevation $Z_A = 100.000\text{ m}$) and point $B$. The backsight rod reading on $A$ is $R_{back} = 1.450\text{ m}$ and foresight rod reading on $B$ is $R_{fore} = 0.850\text{ m}$. What is the elevation $Z_B$ of point $B$?

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