Civil Engineering (CE) Exam > Civil Engineering (CE) Questions > Parallax bar is used to measurea)Parallaxb)Pa...
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Parallax bar is used to measure
- a)Parallax
- b)Parallax difference
- c)Difference in elevation
- d)Reduced level of a point
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
Parallax bar is used to measurea)Parallaxb)Parallax differencec)Differ...
The parallax bar is an instrument designed for use with a mirror stereoscope that has a stereo base of ten inches or less. The bar
is used to determine the height difference of natural and man made features when viewing stereoscopic photographs.
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Parallax bar is used to measurea)Parallaxb)Parallax differencec)Differ...
The bar is used to determine the height difference of natural and man made features when viewing stereoscopic photographs. It measures the relative position of identical points in both photographs, that is their parallax difference. The parallax difference can then be used to compare the relative heights.Parallax bar is used to measure is Parallax difference
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Parallax bar is used to measurea)Parallaxb)Parallax differencec)Differ...
Parallax Bar
- A parallax bar is a surveying instrument used to measure the difference in parallax between two points.
- It is also known as an optical square or a reflecting prism.
- It consists of a rectangular frame with two parallel mirrors fixed at each end.
- The mirrors are inclined at an angle of 45 degrees to the frame and are coated with a reflective material.
- The frame also has two vertical sights fixed at each end.
- The parallax bar is used to measure the parallax difference between two points.
Parallax Difference
- Parallax is the apparent shift in the position of an object when viewed from different positions.
- The parallax difference between two points is the difference in the apparent position of the same object when viewed from these two points.
- The parallax bar is used to measure the parallax difference between two points by observing the position of a target through the mirrors of the instrument.
Application in Surveying
- The parallax bar is used in surveying to measure the difference in elevation between two points.
- It is also used to determine the reduced level of a point by measuring the parallax difference between the point and a known benchmark.
- The instrument is set up at the benchmark and the position of the target is observed through the mirrors.
- The instrument is then moved to the point whose reduced level is to be determined and the position of the target is observed again.
- The parallax difference between the two observations is measured and used to determine the reduced level of the point.
Conclusion
- In conclusion, the parallax bar is a useful instrument in surveying for measuring the parallax difference between two points.
- It is used to determine the difference in elevation between points and to determine the reduced level of a point.
- The instrument consists of a rectangular frame with two parallel mirrors fixed at each end and is used to observe the position of a target through the mirrors.
- A parallax bar is a surveying instrument used to measure the difference in parallax between two points.
- It is also known as an optical square or a reflecting prism.
- It consists of a rectangular frame with two parallel mirrors fixed at each end.
- The mirrors are inclined at an angle of 45 degrees to the frame and are coated with a reflective material.
- The frame also has two vertical sights fixed at each end.
- The parallax bar is used to measure the parallax difference between two points.
Parallax Difference
- Parallax is the apparent shift in the position of an object when viewed from different positions.
- The parallax difference between two points is the difference in the apparent position of the same object when viewed from these two points.
- The parallax bar is used to measure the parallax difference between two points by observing the position of a target through the mirrors of the instrument.
Application in Surveying
- The parallax bar is used in surveying to measure the difference in elevation between two points.
- It is also used to determine the reduced level of a point by measuring the parallax difference between the point and a known benchmark.
- The instrument is set up at the benchmark and the position of the target is observed through the mirrors.
- The instrument is then moved to the point whose reduced level is to be determined and the position of the target is observed again.
- The parallax difference between the two observations is measured and used to determine the reduced level of the point.
Conclusion
- In conclusion, the parallax bar is a useful instrument in surveying for measuring the parallax difference between two points.
- It is used to determine the difference in elevation between points and to determine the reduced level of a point.
- The instrument consists of a rectangular frame with two parallel mirrors fixed at each end and is used to observe the position of a target through the mirrors.
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Parallax bar is used to measurea)Parallaxb)Parallax differencec)Difference in elevationd)Reduced level of a pointCorrect answer is option 'B'. Can you explain this answer? for Civil Engineering (CE) 2025 is part of Civil Engineering (CE) preparation. The Question and answers have been prepared according to the Civil Engineering (CE) exam syllabus. Information about Parallax bar is used to measurea)Parallaxb)Parallax differencec)Difference in elevationd)Reduced level of a pointCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for Civil Engineering (CE) 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Parallax bar is used to measurea)Parallaxb)Parallax differencec)Difference in elevationd)Reduced level of a pointCorrect answer is option 'B'. Can you explain this answer?.
Parallax bar is used to measurea)Parallaxb)Parallax differencec)Difference in elevationd)Reduced level of a pointCorrect answer is option 'B'. Can you explain this answer? for Civil Engineering (CE) 2025 is part of Civil Engineering (CE) preparation. The Question and answers have been prepared according to the Civil Engineering (CE) exam syllabus. Information about Parallax bar is used to measurea)Parallaxb)Parallax differencec)Difference in elevationd)Reduced level of a pointCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for Civil Engineering (CE) 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Parallax bar is used to measurea)Parallaxb)Parallax differencec)Difference in elevationd)Reduced level of a pointCorrect answer is option 'B'. Can you explain this answer?.
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