Question

In surface photography of measuring surface finish of machined surfaces using vertical illumination, which portion appears as bright area?

• A. Hills
• B. Scratch
• C. Valleys
• D. Flat portion

Hint:

When analyzing surface finishes using vertical illumination, look for bright areas (hills) to identify the high points of the surface, and darker areas (valleys) to identify the low points.

Answer 1

The Correct Option is A

In surface photography, particularly when using vertical illumination, the hills or raised areas of a machined surface will appear as bright areas. This is because the light reflects more strongly from the higher surfaces. On the other hand, valleys or lower areas absorb more light, leading to darker regions in the image. This technique helps to visually assess the surface roughness and texture of the material.