Which method reduces glare on an inspection surface?

• A. Polarized light
• B. Visible light
• C. Screens
• D. Spectral light

Answer: (A)

Reducing glare from a reflective inspection surface hinges on polarization of light. Glare from smooth surfaces is often highly polarized in a specific plane, so using polarized illumination and a polarizing filter in front of the eye or the viewing device lets you block that polarized glare. When the polarizer is oriented at right angles to the glare’s polarization, the reflected glare is suppressed while light carrying surface detail passes through, making features and defects easier to see. You can adjust the polarizer until the glare diminishes. Ordinary visible light or spectral variations don’t inherently suppress glare, and simply using screens isn’t the targeted method for glare reduction in this context. Polarized light is the effective approach.