Fresnel Biprism setup illustrates about the phenomenon of interference of light. With the help of interference phenomenon, we can find the wavelength of monochromatic light source like sodium light in a very easy manner. Complete with optical bench of one meter long of Cat. No. 1656 with 5 riders & Bi-prism assembly as per Cat. No. 1835 and Fresnel Bi-prism of Cat. No. 1837. Supplied without sodium light source.