28 Jul Double Concave Lens, 300mm Focal Length, 3″ (75mm) Diameter – Eisco Labs
300MM FOCAL LENGTH || Diverging lens with a 300mm focal length. DOUBLE CONCAVE || Highly polished, double concave lens. Made of highly polished, quality glass. Spherical with ground edges. Designed for educational purpose and science classroom demonstrations in optics and light physics....