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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