Optical Flat & Monochromatic

An optical flat must be used in conjunction with a monochromatic light source to view accurate interference fringe patterns of a flat surface. The unit must be sized large enough to completely cover and illuminate the optical flat being used. The specific gas in the light tube radiates light waves of a specific length. The wavelength of light is the measurement reference utilized by the optical flat (remember, half of the wavelength is a light band).