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| 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 |
| 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. | |
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