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

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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

The question was asked in my homework.

Question is taken from Methods of Measuring Surface Finish in section Measurement of Surface Finish of Engineering Metrology

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Correct option is (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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