Fresnel's Biprism Experiment It is an optical device to obtain two coherent sources by the refraction of lights. The angle of biprism is $179^{\circ}$ & refracting angle is $\alpha=1 / 2^{\circ}$ .

A Fresnel Biprism is a variation on the Young’s Slits experiment. The Fresnel biprism consists of two thin prisms joint at their bases to form an isosceles triangle. A single wavefront impinges on both prisms; the left por-tion of the wavefront is refracted right while the right segment is …

2025年1月24日 · A Fresnel biprism is just a variation of Young’s double-slit experiment. It is obtained by placing two thin prisms base to base forming an isosceles triangle. It is used to obtain two coherent virtual sources of light waves to produce the interference pattern.

The aim of this experiment is to determine the wavelength of sodium light using a Fresnel biprism. In order to achieve the aim of this experiment I needed a sodium light lamp, a slit, a Fresnel biprism, a lens and an eye-piece. Using the method of measuring the distance across a number of fringes, I found that = (691 4) nm.

In Fresnel’s biprism experiment a biprism is used to make the two coherent sources of light. Then the waves from these two virtual sources interfere on the screen to give a pattern of bright and dark fringes.

In this experiment, the wavelength of light from a sodium lamp and the wave-length of light from a neon lamp were calculated using the Fresnel Biprism method.

OBJECT: To determine the wavelength of sodium light by Fresnel’s Biprism method. APPARATUS: Optical bench with four uprights, a sodium lamp, Fresnel’s Biprism, a convex lens and micrometer eyepiece.