Description

Alternate-model 75mm double-concave glass lens at 300mm focal length

plus glass

Used to compare magnet strengths across the bar-magnet series

Reproduces Ewald von Kleist's 1745 charge-storage device with concentric metal cups around a plastic dielectric

Plano-Convex Glass Lens, 50mm Diameter, 200mm Focal Length Features_Handle & Spout Alternate-model 75mm double-concave glass lensLong focal plano convex glass lens at 50mm diameter and 200mm focal length, the f 4 geometry projecting collimated and well formed real images onto distant screens.

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Plano-Convex Glass Lens, 50mm Diameter, 200mm Focal Length Features_Handle & Spout Alternate-model 75mm double-concave glass lens

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