Double Concave Glass Lens, 50mm Diameter, 150mm Focal Length

This round double concave optical glass lens measures 2 inches (50mm) in diameter and approximately 5.5mm thick, with a 150mm focal length. Designed for physics and educational use; thickness may vary slightly as consistency is not critical for educational applications. Minor cosmetic imperfections may be present but do not affect optical function. Suitable for physics classroom demonstrations of light divergence, virtual image formation, and concave lens behavior.