Double Concave Lens, 150mm Focal Length, 1.5" (38mm) Diameter - Spherical, Optically Worked Glass Lens - Ground Edges, Polished - Great for Physics Classrooms - Eisco Labs home2022 As the saying goes

As the saying goes

Comes in three baits per package

so you can use it with confidence

available only from InSinkErator

48" length by 1

Double Concave Lens, 150mm Focal Length, 1.5" (38mm) Diameter - Spherical, Optically Worked Glass Lens - Ground Edges, Polished - Great for Physics Classrooms - Eisco Labs home2022 As the saying goesDouble Concave Lens, 150mm Focal Length, 1. 5" (38mm) Diameter Spherical, Optically Worked Glass Lens Ground Edges, Polished Great for Physics Classrooms Eisco Labs Product Features DOUBLE CONCAVE Highly polished, double concave lens SPHERICAL Lens measures 1. 5" (38mm) in diameter 150MM FOCAL LENGTH Diverging lens with a 150mm focal length OPTICALLY WORKED GLASS Made of high quality, optically worked glass. Highly polished with ground edges GREAT FOR