BI-CONCAVE LENS, DIA. 50MM F: 10CM OR F: 20CM

Spherical Lenses: Double Concave

With optically worked faces and ground edges, for educational purposes.

Diameter: 50mm
Focal Length: 200mm or 100mm
Power: -5D or -10D
Refractive index: 1.52 approx.
Material: Float Glass

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