Double Convex Glass Lens, 75mm Diameter, 200mm Focal

This double convex lens is made from high-quality, optically worked glass with a spherical profile, ground edges, and a highly polished finish. The lens measures 3 inches (75mm) in diameter with a converging focal length of 200mm and a refractive index of 1.52. As a converging lens, it focuses parallel light rays to a point at 200mm from the lens center. The larger 75mm diameter collects more light than smaller lenses, producing brighter images. Designed for physics classroom demonstrations in optics and light refraction.