[Solved] Which of the following is true for a method of measurement of surface finish with surface photographs?

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Q.	Which of the following is true for a method of measurement of surface finish with surface photographs?
A.	different type of illumination is needed
B.	no effect of type of illumination
C.	same type of illumination is needed
D.	monochromatic light is needed
Answer» A. different type of illumination is needed
Explanation: in the method of surface inspection with magnified photographs of the surface are taken with different types of illumination. after this photographs with different illumination are studied and compared.

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