Waldorf Science Kit #10 Optics - Lenses, Grades 7 & 8This Waldorf Science Kit was developed to assist teaching grades 7 & 8 science blocks in the Waldorf Curriculum. This kit contains materials to construct an optics bench and includes: hardware needed to construct the bench 2 candles 2 double convex lenses, 38mm 1 double concave lens, 38mm 1 concave spherical mirror, 75mm 1 convex spherical mirror, 75mm 1 double convex lens, 3. 75cm f5cm 50mm double convex lens, f500mm Sold as a single item. Detailed