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Bi-Convex Glass Lens, 75 mm Diameter, 500 mm Focal Length
Polished glass with ground edges and 500 mm focus.
Mirrors, Spherical, Convex Diameter 50 Mm; Focal Length 20 Cm
Small convex mirrors for close-up reflections.
Mirrors, Spherical, Convex Diameter 75 Mm; Focal Length 15 Cm
Small convex mirrors for magnification, 15cm focal length.
Mirrors, Spherical, Convex Diameter 75 Mm; Focal Length 25 Cm
Small convex mirrors for focused reflection.