Lens, Acrylic 38 mm Set/6

These are great for optical benches, and other experiments in optics and come with a variety of useful focal lengths. One each: double convex, planoconvex, concavo-convex, double concave, plano-concave and convexo-concave.

6 demonstration glass lenses 38 mm diameters and focal lengths of 20, 30 and 40. Activity guide included.