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What is the range of straightness measurement in straightness measurement optics?

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What is the range of straightness measurement in straightness measurement optics?

(a) ±2.5 mm

(b) ±5 mm

(c) ±10 mm

(d) ±20 mm

I got this question in an online quiz.

I need to ask this question from Straightness topic in chapter Straightness, Flatness, Squareness, Parallelism, Circularity and Rotation of Engineering Metrology

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Correct answer is (a) ±2.5 mm

The explanation: To measure straightness errors in a linear axis, straightness measurement optics are used. For both short range and long range measurement, length of straightness measurement is ±2.5 mm.

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