Purpose: Class view of Fabrey-Perot interferometer fringes.
Description: The Fabrey-Perot interferometer etalon is mounted on the Michelson interferometer base and illuminated by a laser beam expanded with a 40x beam expander mounted on the laser. The interference pattern can be viewed directly for class display with a TV camera with zoom lens: set focus at infinity, adjust f-stop for desire brightness, and zoom to desired size.
