Parallax Error
Parallax error in reading scale minimized by:
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About This Question
- Subject
- physics
- Chapter
- experimental skills and error analysis
- Topic
- parallax error
- Difficulty
- Hard
- Year
- 2025
Solution
Correct Answer:
Aligning eye perpendicular to scale
Parallax is the apparent shift in position of an object (like a needle) against a background (the scale) when viewed from different angles.
- To avoid this, the line of sight must be perpendicular to the plane of the scale.
- Many precision analog meters use a mirror under the needle; the reading is correct only when the needle hide its own reflection.
This hard difficulty physics question is from the chapter experimental skills and error analysis, covering the topic of parallax error. It appeared in the 2025 exam.
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