Prisms, Acrylic Set/6 Perform refraction experiments and study the behavior of light with this handy set of 6 prisms. All are made of 15 mm thick acrylic with polished sides. Includes rectangular (75 x 50 x 15 mm); semicircular (90 mm base); equilateral (75 mm sides); double convex lens (90 mm, 23 mm at center); two double concaves lenses (90 mm, 10 mm at center); wood box with storage compartments. Qty :