When performing a visual exam, the minimum angle of eye to part?

When performing a visual exam, the minimum angle of eye to part?

• A. 15°
• B. 45°
• C. 30°
• D. 60°

Answer: (C)

When performing a visual inspection, viewing the surface at an oblique angle helps reveal defects by creating lighting and shadow effects that emphasize surface irregularities. The eye should be kept at a minimum of 30 degrees to the part so you can see pits, corrosion, cracks, or deformations more clearly. Angles smaller than this (like 15°) tend to wash out detail due to glare and lack of shadow contrast, while larger angles (45° or 60°) are fine but exceed the minimum requirement. So, the smallest effective viewing angle is 30 degrees.

When performing a visual inspection, viewing the surface at an oblique angle helps reveal defects by creating lighting and shadow effects that emphasize surface irregularities. The eye should be kept at a minimum of 30 degrees to the part so you can see pits, corrosion, cracks, or deformations more clearly. Angles smaller than this (like 15°) tend to wash out detail due to glare and lack of shadow contrast, while larger angles (45° or 60°) are fine but exceed the minimum requirement. So, the smallest effective viewing angle is 30 degrees.