... and Lighting1. Raw material of magnifying lens: Pyrex, Optical glass. Crystal glass2. Techniques of magnifying lens: by Molding, Grinding, Polishing3 ... convex,double convex,bi convex,cylindric4. Inside quality of magnifying lens: clear and transparent, no mold marks, no inside ... bubble and dirts,5. Function of magnifying lens: magnifying lens for magnifier for Lighting and Optical purpose