* 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, 0.40, 0.30 mm nominal diameter * Hologram * 2 Polaroids

* All mounted in 35mm slide frames as pictured.