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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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