Diffraction Kit – 18 slides-[B]Diffraction Kit – 9 Slides. Six slides of 1 to 6 slits. Three gratings to match the slits [B]Diffraction Kit – 18 Slides. Six slides of 1 to 6 slits. Three gratings to match the slits .Diffraction grating 80 lines/mm .Diffraction grating 300 lines/mm . Single slit – Tapered . Double slit – Tapered . Metal gauze – 300 mesh . Circular apertures 1.0, 0.60, 1.40, 0.30mm nominal diameter . Hologram .2 Polaroids