American Educational Products
American Educational Products Double-Convex Lens 50 MM D X 20 CM FL, Set of 25 -
American Educational Set of 25 Double-Convex Lens 50 MM D X 20 CM FL 7-909-11
- Double concave lenses
- Have two inwardly curved surfaces
- A negative focal length and are often
- Superior quality lenses are useful for teaching a variety of optical principles
- Lenses Double Concave 50 mm. D X 20 cm. fl.
