K9 100mm Focal Length Optical Glass Convex Lens, Convex Lens, 2.5 X Magnifying Factor For Physical Optics Experiment Lens DIY Magnifying Lens
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K9 100mm Focal Length Optical Glass Convex Lens, Convex Lens, 2.5 X Magnifying Factor For Physical Optics Experiment Lens DIY Magnifying Lens

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