Laser beam through various slit and grating combinations.

Laser beam through various slits (and Cornell Slitfilm). Monochromatic Helium-Neon laser light is passed through a single, double or multiple slit, and the resulting diffraction pattern is displayed on a white projection screen. The laser is mounted on a telescope goniometer, making it easy to move from one ruling to another. The electroformed slits mounted on 35 mm slides are the most accurate and provide the cleanest diffraction patterns. There are 3 of these slides: a) one with single slits, b) one with double slits with different spacings, and c) one with two slits up to five slits. The Cornell Interference and Diffraction Slitfilm is a piece of black film with transparent single and multiple rulings of various widths and spacings. It is not as accurate as the electroformed slits, but it has more variety. Note: Same set-up as X