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In case of vertical illumination in measuring surface finish with surface photographs, which will appear as bright area?

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In case of vertical illumination in measuring surface finish with surface photographs, which will appear as bright area?

(a) Flat portion

(b) Scratch

(c) Irregularity

(d) Hills

This question was addressed to me during an interview.

This intriguing question originated from Methods of Measuring Surface Finish topic in division Measurement of Surface Finish of Engineering Metrology

1 Answer

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Best answer
Right choice is (a) Flat portion

The best I can explain: In the inspection of surface with photographs if we use vertical illumination, then irregularities and scratches appear as dark spots and flat portion of the surface as bright area. But in case of oblique illumination, the case is reverse.

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