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For testing straightness with the help of spirit level, what is the length of each surface section?

For testing straightness with the help of spirit level, what is the length of each surface section? Correct Answer Equal to spirit level base length

For determining straightness, a straight line is drawn on the surface. It is divided into sections, the length of individual section is equal to the length of the base of spirit level or the base of a reflector in case of autocollimator.

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