In conjunction with the five-beam optical lamp U21880, this equipment set is intended for experiments introducing students to geometric optics. The optical components are made of acrylic glass. Height: 15 mm each Scope of delivery: 1 Planar-convex lens 2 Bi-convex lenses 1 Bi-concave lens 1 Equilateral prism 1 Rectangular prism 1 Irregular prism 1 Plane-parallel plate 1 Semicircular element 1 Cylindrical lens