This double convex lens is made from optically worked glass with highly polished faces and ground edges. It is spherical in profile, measuring 1.5 inches (38 mm) in diameter with a converging focal length of 50 mm. The refractive index is 1.52. Designed for educational use, this lens is suitable for physics classroom demonstrations in optics and light refraction. Its standard dimensions make it compatible with most optical bench setups used in secondary and post-secondary science instruction.