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An imaginary line joining the point of intersectionof the cross-hairs of the diaphragm and the opticalcentre of teh object glass is known as
  • a)
    axis of telescope
  • b)
    axis of level tube
  • c)
    line of collimation
  • d)
    horizontal axis
Correct answer is option 'C'. Can you explain this answer?
Most Upvoted Answer
An imaginary line joining the point of intersectionof the cross-hairs ...
Line of Collimation
The line joining the point of intersection of the cross-hairs of the diaphragm and the optical centre of the object glass is known as the line of collimation. This line plays a crucial role in the functioning of optical instruments like telescopes and leveling instruments.

Importance of Line of Collimation
- **Alignment**: The line of collimation ensures that the telescope or leveling instrument is properly aligned with the target or object being observed. It helps in achieving accuracy in measurements.
- **Determining Horizontal Axis**: By establishing the line of collimation, the horizontal axis of the instrument can be defined. This axis is essential for various surveying and engineering tasks.
- **Precision**: Maintaining the line of collimation is critical for obtaining precise and reliable measurements. Any deviation in this line can lead to errors in observations.

Function in Telescopes
In telescopes, the line of collimation helps in accurately aiming at distant objects. It allows the user to focus on specific points and track movements with precision. Without a well-defined line of collimation, the telescope's accuracy and performance would be compromised.

Function in Leveling Instruments
For leveling instruments, such as dumpy levels or auto levels, the line of collimation is essential for ensuring that the instrument is correctly leveled and measurements are taken accurately. It serves as a reference line for determining elevations and slopes.
In conclusion, the line of collimation is a fundamental concept in optical instruments, ensuring alignment, accuracy, and precision in observations and measurements. Understanding its significance is crucial for anyone working with telescopes, leveling instruments, or other optical devices.
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An imaginary line joining the point of intersectionof the cross-hairs ...
Line is collimation right
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An imaginary line joining the point of intersectionof the cross-hairs of the diaphragm and the opticalcentre of teh object glass is known asa)axis of telescopeb)axis of level tubec)line of collimationd)horizontal axisCorrect answer is option 'C'. Can you explain this answer?
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