Airy's disk: Pinhole diffraction using laser beam.

Airy Disk: Pinhole diffraction using laser beam. Monochromatic Helium-Neon laser light is passed through one of three small circular electroformed pinholes. The resulting circular diffraction pattern (Airy's Disk) is enlarged using a diverging lens, then displayed on a white projection screen. The laser is mounted on a moveable telescope goniometer. Three pinholes of different size can be demonstrated (.12,.24 and .48 mm).