Description :
It consists of set of 18 slides : 6 slides of 1 to 6 slits, 3 gratings to match the slits, diffraction grating (80 & 300 lines per mm), single & double slits tapered, metal gauze 300 mesh, circular apertures 1.0, 0.60, 1.40, 0.30 mm nominal diameter, hologram & 2 polaroids. Each is mounted in slide frame and protected by two glass plates.