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

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Q.	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
Answer» 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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