Physics - Optics - Lenses - Convex and concave lenses - Lens Detectives

Students sort 10 optical devices into 'Uses Convex Lens' vs 'Uses Concave Lens'. Convex (converging): Magnifying glass, Camera, Projector, Eye (crystalline lens), Telescope objective, Microscope. Concave (diverging): Spectacles for short-sightedness (myopia), Peephole in a door, Laser beam expanders