Finding Collimation Error of a Level using Two Peg Test Method|Solved Problem

In this video we will learn how to find collimation error of a level using Two Peg Test Method and then find the corrected staff readings.
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Question: When carrying out the permanent adjustments of a dumpy level by two-peg method, the following observation were made.
Instrument at E midway between C and D, 100 m apart.
Reading at point C = 2.0 m
Reading at point D = 3.0 m
Instrument at F in line of CD such that CF = 120 m and DF = 20 m.
Reading at point C = 1.50 m
Reading at point D = 2.75 m
Check whether the instrument needs permanent adjustments or not, and whether the line of sight is inclined downwards. What should be the correct reading at C and D if the instrument is to be adjusted?

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