Single slit diffraction using laser beam through adjustable slit.

Single Slit Diffraction using laser beam through adjustable slit. Monochromatic Helium-Neon laser light passes through an adjustable slit. The resulting diffraction pattern is displayed on a white projection screen. When the slit is barely open, the central beam is smeared over much of the screen. When the slit is opened more,an intense central maximum dot and periodic less intense maxima dots are observed. As the slit is opened more, the spacing shrinks between the maxima until just the central dot is observed.