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

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Mr. Dubey

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📊 Metrology and Measurements

Q. 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

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✅ Correct Answer: (A) flat portion

Explanation: 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.

Explanation by: Mr. Dubey

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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