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Consider the following statements –
1. The size of a theodolite is defined by the diameter of the graduated circle of the lower plate.
2. The process of establishing intermediate points, on a given straight line whose ends are intervisible, is done with a theodolite is called lining in.
3. Removal of parallax may be achieved by refocusing the eyepiece.
4. An imaginary line passing through the optical center of the eyepiece in the telescope of a surveying instrument is called the line of collimation.
Which of the above statement are correct?
  • a)
    1, 2 and 4
  • b)
    2, 3 and 4
  • c)
    1, 2 and 3
  • d)
    1, 3 and 4
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
Consider the following statements –1. The size of a theodolite is def...
1. The size of the theodolite is defined by the diameter of the graduated circle of the lower plate.
2. The process of establishing intermediate points, on a given straight line whose ends are intervisible is done with a theodolite is called lining in.
3. Removal of parallax may be achieved by refocusing the eyepiece and the objective.
4. Line of collimation: It is an imaginary line passing through the intersection of the crosshairs at the diaphragm and the optical center of the object glass and its continuation.
5. Axis of Bubble tube: It is an imaginary line tangential to the longitudinal curve of the bubble tube at its midpoint.
6. Axis of a telescope: This axis is an imaginary passing through the optical center of the object-glass and the optical center of the eye-piece.
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Most Upvoted Answer
Consider the following statements –1. The size of a theodolite is def...
Correct statement identification:

1. The size of a theodolite is defined by the diameter of the graduated circle of the lower plate.
2. The process of establishing intermediate points, on a given straight line whose ends are intervisible, is done with a theodolite is called lining in.
3. Removal of parallax may be achieved by refocusing the eyepiece.
4. An imaginary line passing through the optical center of the eyepiece in the telescope of a surveying instrument is called the line of collimation.

Correct option: C) 1, 2 and 3

Explanation:

1. The size of a theodolite is defined by the diameter of the graduated circle of the lower plate: The size of a theodolite is not only defined by the diameter of the graduated circle of the lower plate but also by various other factors such as the size of the telescope, the accuracy of the instrument and the quality of its components. This statement is incorrect.

2. The process of establishing intermediate points, on a given straight line whose ends are intervisible, is done with a theodolite is called lining in: This is a correct statement. The process of establishing intermediate points, on a given straight line whose ends are intervisible, is done with a theodolite is called lining in.

3. Removal of parallax may be achieved by refocusing the eyepiece: This is a correct statement. Removal of parallax may be achieved by refocusing the eyepiece. Parallax is the apparent shift of an object when viewed from different positions, and it can be removed by adjusting the eyepiece until the crosshairs are in sharp focus.

4. An imaginary line passing through the optical center of the eyepiece in the telescope of a surveying instrument is called the line of collimation: This is a correct statement. An imaginary line passing through the optical center of the eyepiece in the telescope of a surveying instrument is called the line of collimation.

Therefore, the correct statements are 2, 3 and 4.
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Consider the following statements –1. The size of a theodolite is defined by the diameter of the graduated circle of the lower plate.2. The process of establishing intermediate points, on a given straight line whose ends are intervisible, is done with a theodolite is called lining in.3. Removal of parallax may be achieved by refocusing the eyepiece.4. An imaginary line passing through the optical center of the eyepiece in the telescope of a surveying instrument is called the line of collimation.Which of the above statement are correct?a)1, 2 and 4b)2, 3 and 4c)1, 2 and 3d)1, 3 and 4Correct answer is option 'C'. Can you explain this answer?
Question Description
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