Double Concave Glass Top Spinning Base, 125mm, 20mm Focal Length

This double concave optical glass lens has a diameter of 5" (125mm) with edge thickness of approximately 12mm and a focal length of 350mm. The lens is made from optically worked glass with a refractive index of 1.52, featuring ground and beveled edges. The large 125mm diameter and concave surfaces make this lens suitable for top spinning demonstrations as well as optics experiments involving diverging lenses. The lens is optically true and designed for educational use in physics classrooms.