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For experiments on optical instruments, lens laws and much more; Converging lens made of high-quality glass, mounted in SE optical mountLens material: optical glassFocus length: Fl = +100 mmLens diameter: 50 mmDimensions: D= 53 mm, H= 27 mmMaterial of the lens mount: Polyamide glass fiber reinforced, blackMass: approx. 37 gadditionally recommended:P5310-2A Lens holder, SE