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

interference lines plays an important role in identification of the defect

monochromatic source of light is used

depth of defect canâ€™t be measured

interference lines plays an important role in identification of the defect

Which of the following is not true for the method of measurement of s

1.	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 canâ€™t be measured
D.	interference lines plays an important role in identification of the defect
Answer» D. interference lines plays an important role in identification of the defect