A set of compatible items which will enable diffraction to be investigated with slits, gratings, pinhole spots and other obstacles. The set comprises:. 1 Set of six lenses: focal lengths -100, -50, +50, +100, +200 and +1000mm. 3 Lens holders. 1 Slide holder for 50mm square slides. 1 Pinhole slide, 50mm square, with holes of 0.2, 0.1 and 0.05mm. 1 Slide with single and double slits. Set of six slides with 1, 2, 3, 4, 5, and 6 slits respectively. 1 Set of three diffraction grating slides of 150 and 300 lines/mm. 1 Air cell for refractive index of gases. Path length 75mm approx. 2 Microscope slides: 76 x 25mm. 1 Glass scale: 200 x 25 x 6mm, scale 0 to 150 mm x 1mm. 1 Support stand for glass scale. 1 Slide, 50mm square with circular obstacles for Fresnel diffraction. 6 Bead headed mapping pins and needle for Fresnel diffraction. 1 Hologram (ready prepared). 1 Copy of Manual of School Laser Demonstrations. Lasers can be purchased separately:. B8A46139 - Philip Harris Semi-Conductor Laser. B8H83651 - Unilab Solid State Laser.
