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

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Q.	Which of the following is a destructive method in measuring surface finish?
A.	gloss measurement
B.	taper sectioning
C.	diffraction technique
D.	micro interferometer
Answer» 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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