The line passing through the intersection of the horizontal and vertical cross hairs and optical centre of the object glass and its continuation:a)Horizontal axisb)Vertical axisc)Line of collimationd)Swing lineCorrect answer is option 'C'. Can you explain this answer?

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The line passing through the intersection of the horizontal and vertical cross hairs and optical centre of the object glass and its continuation:

a)
Horizontal axis
b)
Vertical axis
c)
Line of collimation
d)
Swing line

Correct answer is option 'C'. Can you explain this answer?

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The line passing through the intersection of the horizontal and vertic...

Line of collimation:

The line passing through the intersection of the horizontal and vertical cross hairs and optical centre of the object glass and its continuation is known as the line of collimation. This line is a crucial component in surveying and leveling instruments as it serves as the reference line for sighting and measuring.

Importance of the line of collimation:
- The line of collimation ensures that the instrument is properly aligned and leveled for accurate measurements.
- It helps in establishing a straight line of sight between the instrument and the target, enabling precise readings to be taken.
- By maintaining the line of collimation, errors in measurements due to misalignment or distortion can be minimized.

Use in surveying:
- Surveyors rely on the line of collimation to accurately measure distances, angles, and elevations during surveying tasks.
- It is used in leveling instruments such as theodolites and levels to ensure that the instrument is properly set up and aligned.

Alignment and adjustment:
- Proper alignment of the line of collimation is essential for the instrument to function accurately.
- Surveying instruments need to be regularly checked and adjusted to maintain the integrity of the line of collimation.

In conclusion, the line of collimation plays a crucial role in surveying and leveling instruments by providing a reference line for accurate measurements and ensuring proper alignment. It is a fundamental concept that surveyors must understand and apply in their work to achieve reliable and precise results.

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The line passing through the intersection of the horizontal and vertic...

There are five fundamental lines in a Theodolite:

Vertical axis (Azimuth axis): It is the axis about which the instrument rotates in the horizontal plane.
Horizontal Axis (Trunnion axis): It is the axis about which the instrument rotates in the vertical plane.
Line of Collimation (Line of Sight): It is the line that passes through the intersection of horizontal and vertical crosshairs and the optical center of the object glass.
Bubble Line (Level tube axis or Altitude level axis): It is a straight line tangential to the longitudinal curve of the level tube at its center. It is horizontal when the bubble is center.
Plate level axis: It is perpendicular to the vertical axis when a bubble is at the center.

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The line passing through the intersection of the horizontal and vertical cross hairs and optical centre of the object glass and its continuation:a)Horizontal axisb)Vertical axisc)Line of collimationd)Swing lineCorrect answer is option 'C'. Can you explain this answer?

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