Objective Question & Answer

Assertion (A) is true: In plane table surveying.

Lehman's method (a trial-and-error method) is one of the most accurate and widely used

approaches to solve the three-point problem. It relies entirely on a set of rules known as

Lehman's rules to find the true position of the instrument station

Reason (R) is true: Lehman's rules provide a systematic, controlled technique to estimate the

position of the true point from the triangle of error. By applying these rules iteratively, the size

of the triangle reduces until it converges to a single point

Correct Explanation: Since these rules describe the mechanism of how the trial-and-error

procedure functions to solve the three-point problem, Relation (R) is the correct explanation

of Assertion (A).