M

Mr. Dubey • 52.26K Points
Coach 

Q. Which of the following is not true for the method of measurement of surface finish by micro interferometer?

(A) optical flat is used
(B) monochromatic source of light is used
(C) depth of defect can’t be measured
(D) interference lines plays an important role in identification of the defect
Correct : Option (C)

Explanation: 
 in the method of inspection of surface by using micro interferometer, an optical flat is used which is placed on the surface to be examined and illuminated by using monochromatic light. interference bands are studied by using a microscope.

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