Bi-convex lens fitted in nickel plated metal frame with metallic handle. Diameter Focal Length Magnification (a) 50 mm 10 cm 3.5 x (b) 50 mm 15 cm 2.5 x (c) 60 mm 15 cm 2.5 x (d) 60 mm 20 cm 2.25 x (e) 75 mm 15 cm 2.5 x (f) 75 mm 20 cm 2.25 x (g) 100 mm 15 cm 2.5 x (h) 100 mm 20 cm 2.25 x |
