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Slabs Plus - Concave VS Convex 🤓 ➖ Concave lenses have a hallow curved front. This "minus" lens causes light rays to diverge or spread apart ➖ ➕ Convex lenses have a
ERH India 2 Pcs Plano Convex Lens Diameter-50 mm Focal Length-10 cm for Magnifying Glasses, Telescopes, Cameras and Photography etc. : Amazon.in: Electronics