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Which of the following is not the factor affecting the accuracy of straightness measurement by optics?

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Which of the following is not the factor affecting the accuracy of straightness measurement by optics?

(a) Air turbulence

(b) Optics fixed rigidly

(c) Slope error

(d) Localised heat sources

The question was asked during an interview.

The origin of the question is Straightness in portion Straightness, Flatness, Squareness, Parallelism, Circularity and Rotation of Engineering Metrology

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The correct choice is (b) Optics fixed rigidly

Explanation: Factors affecting the accuracy of straightness measurement by optics are Air turbulence, Mechanical vibrations, Optic errors, Slope errors, Optics not fixed in the correct position, Optics not fixed rigidly, Localised heat sources etc.

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