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Which of the following is a destructive method in measuring surface finish?

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Which of the following is a destructive method in measuring surface finish?

(a) Gloss measurement

(b) Taper sectioning

(c) Diffraction technique

(d) Micro interferometer

This question was posed to me in an internship interview.

My question is from Methods of Measuring Surface Finish in chapter Measurement of Surface Finish of Engineering Metrology

1 Answer

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Right answer is (b) Taper sectioning

Explanation: In taper sectioning method, a section is cut through the surface to be inspected at a shallow angle, thus magnifying height variations by a factor of cot theta, and the section is studied by optical microscope. It is an accurate but destructive method.

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