These superior quality unmounted Double Concave Lenses with ground edges are useful for teaching a variety of optical principles.
|7-909-8||38mm d. x 10 cm. F.L.|
|7-909-9||38mm d. x 15 cm. F.L|
|7-909-10||38mm d. x 20 cm. F.L.|
|7-909-11||50mm d. x 20 cm. F.L.|
|7-909-21||50mm d. x 10 cm. F.L.|
|7-909-22||50mm d. x 15 cm. F.L.|
|7-909-12||75mm d. x 20 cm. F.L.|
Double Concave Lenses have two inwardly curved surfaces, a negative focal length, and are often used to aid in the distribution of light as well as image reduction.