This collecting lens is part of a range of 3B Scientific K series lenses (see product description). The range is part of the Kröncke optical system (item number: 1009932 or 1009931), which is a high-quality, advanced experiment set for optics from 3B Scientific The lens itself is made of high-quality optical glass, which is inserted into a 100 mm x 100 mm glare screen. The design of the converging lens is designed for maximum breakage and shock resistance. This makes it ideal for experiments in schools and for internships at universities. Each K series lens has the focal length printed on the glare screen to distinguish between the lens. Focal length f: +50 mm; dimensions: 100 mm x 100 mm; lens diameter: 32 mm
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