During the fining process, what is used?

• A. Water or lubricant sprayed on a pad.
• B. Dry sand.
• C. Oil applied directly to lens.
• D. Air cooling.

Answer: (A)

During finishing, water or a lubricant sprayed on a polishing pad serves multiple essential roles. It cools the lens surface to prevent heat buildup, reduces friction between the pad and the lens so material removal is smooth and controlled, and helps carry away fines and debris to avoid scratches. Using a dry abrasive like sand would be too harsh and create surface damage, oil applied directly to the lens could smear and contaminate the surface, and relying on air cooling wouldn’t provide lubrication or debris removal.