Vonxyz Optical Lens Set, 2" (50mm) Diameter - 3 Double Convex Lens & 3 Double Concave Lens - 200mm, 300mm, 500mm Focal Lengths - Optically True Glass - Ground, Beveled Edges

SPHERICAL || Each lens is spherical in shape and measures 2" (50mm) in diameter. FOCAL LENGTH VARIETY || Converging and diverging focal lengths in 200mm, 300mm and 500mm. OPTICALLY WORKED GLASS || Made of high quality, optically worked glass. Highly polished with ground edges. GREAT FOR PHYSICS CLASSROOMS || This optically true lens set is excellent for physics classroom demonstrations in optics and light refraction. SET OF 6 || Set of six includes 3 double convex lenses and 3 double concave lenses.