Plano-Cylindrical Concave Lens, -17 Diopter, 50 x 50mm Material_Borosilicate Glass Pairs 50mm of aperture with

Pairs 50mm of aperture with a 150mm focal length on a double-concave glass lens at ~5

6 inches for clean pinhole-imaging and diffraction studies

Three-times life size bladder and prostate model separates into two parts exposing the male urinary-reproductive junction for urology teaching

Nine-piece hooked weight set with seven polished brass and two powder-coated steel masses spanning 10 to 1000 grams

tracing hot-air flow between the twin flues

Plano-Cylindrical Concave Lens, -17 Diopter, 50 x 50mm Material_Borosilicate Glass Pairs 50mm of aperture withPlano cylindrical concave lens at 50 by 50mm with 17 diopter power, the cylindrical concave curvature spreading light along a single axis for line focus and divergence demos.