Double Concave Acrylic Lens, 86mm, 20cm Focal Length Glassware letting students snap cord directly

letting students snap cord directly into place for faster classroom setup and teardown

blue and the secondaries green

used for spring-constant and elastic-deformation work

matching the geometry of companion copper and iron rods for controlled thermal-conductivity comparisons

and a month-labeled base for tracking orbital positions through the year

Double Concave Acrylic Lens, 86mm, 20cm Focal Length Glassware letting students snap cord directlyAcrylic double concave lens at 86mm length and 20cm diverging focal length, the lightweight body producing virtual upright reduced images for safer per desk divergence demonstrations.