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3309_50-50MMLenses Spherical, Unmounted, Bi-Concave 50 mm Diameter Fl 50 mm$23352A-03Lenses, Bi-Convex, Acrylic 90x25x15mm$7.60LDS1Lens Demonstration Set, Glass, 50 Mm Lens Set$25RAYLENS5045CVMade Of Polished Glass With Ground Edges. Bi-Concave Lens: Used For Reducing The Size Or Spreading Out Light, With Two Inward Curving Symmetrical Faces. &Nbsp;200 Mm Focal Length. &Nbsp;
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Lenses Spherical, Unmounted, Bi-Concave 38 mm Diameter Fl 1000 mm
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Bi-Concave 38 mm Diameter Fl 100 mm
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Lenses Spherical, Unmounted, Bi-Concave 38 mm Diameter Fl 200 mm
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Lenses Spherical, Unmounted, Bi-Concave 38 mm Diameter Fl 300 mm
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Lenses Spherical, Unmounted, Bi-Concave 38 mm Diameter Fl 500 mm
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Lenses Spherical, Unmounted, Bi-Concave 38 mm Diameter Fl 50 mm
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Lenses Spherical, Unmounted, Bi-Concave 50 mm Diameter Fl 1000 mm
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Lenses Spherical, Unmounted, Bi-Concave 50 mm Diameter Fl 150 mm
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Lenses Spherical, Unmounted, Bi-Concave 50 mm Diameter Fl 200 mm