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100mm Focal Length Optical Convex Lens Physical Glasses for Lab Physics Teaching Transformers It can be used warmITEM NAME: 100mm Focal Length Optical Convex Lens Physical Glasses for Lab Physics Teaching img *{margin: 0; padding: 0;. Focal Length: 100mm. Optical glass lens, laboratory optical bench accessory. 1 piece Optical Glasses Len Toy. Student pupil teaching Aidsthe fun of the lenses learning science knowledge. Due to the different monitor and light effect, the actual color may be slightly different from the picture color.