Double Concave Acrylic Lens, 86mm, 20cm Focal Length Glassware Nine-model set traces embryonic and

Nine-model set traces embryonic and fetal development across the full gestational period

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

Designed to measure Planck's constant through the photoelectric effect

each plain-shanked for clamping or holding

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

Double Concave Acrylic Lens, 86mm, 20cm Focal Length Glassware Nine-model set traces embryonic andAcrylic 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.