Plano-Concave Glass Lens, 50mm Diameter, 50mm Focal Length

This plano concave optical lens has a 50mm diameter and a focal length of -50mm. One face is flat and the other is concave, with both surfaces ground and polished from optical-grade glass to provide clear, accurate light divergence. The lens is designed for physics and optics experiments where students need to observe ray divergence, virtual image formation, and the behavior of negative focal length lenses. It is well suited for use on optical benches, in ray tracing exercises, and in instructional demonstration setups where repeatability and precision matter.