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SPECIFICATION -- Diameter30mm/1.2in, length 100mm/3.9in, Center thickness 5mm, thickness 2.8mm, R = 15 mm
K9 OPTICAL GLASS -- It is made of premium K9 glass ,crystal clear,with great Optical performance
ANTI-REFLECTION FILM -- It is coated with anti-reflection film on the double sides
OPTICS EXPERIMENT -- It can be used for Physical Optics experiment lens
2.5X MAGNIFICATION -- It has 2.5 X magnifying factor,for diy magnifying lens