If the observed back sight and fore sight are x1 and x2. The correction back sig

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If the observed back sight and fore sight are x1 and x2. The correction back sight on A will be equal to x1-y1, where y1= D1 tan i°. The correct fore sight on B will be equal to x2-y2 where, y2 = D2 tan i°. Then what is the correction difference in level between A and B, if D1 = D2?

Options:

A . x1 – x2

B . x2 + x1

C . x1 – x2 + (D2 tan i° – D1 tan i°)

D . x2 – x1 + (D1tan i° + D2 tan i°)

Answer: Option A
Answer: (a).x1 – x2

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