Theory: The Fresnel biprism experiment was one of the early experiments which demonstrated the phenomenon of interference between two coherent light. Principle Along with the Fresnel double mirror experiment, this experiment with a Fresnel biprism is another one of historical significance which was performed. In this experiment the wavelength of Sodium Light was measured using the so called Fresnel Biprism method. This has several advantages.

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Line joining the slit and edge of biprism is made parallel to the length of optical bench.

Application of Fresnel Biprism

JavaScript seems to be disabled in your browser. Measure the distance between frdsnel two images. Engineering Physics by Dr.

MST-I Nov The fringes so obtained should be made clear by adjusting biprism slit and eyepiece. You must have JavaScript enabled in your browser to utilize the functionality of this website.

Biprism can be used to determine the wavelength of given monochromatic light using the expression. This distance between source and eyepiece is directly measured on the optical bench scale. Light from monochromatic source is made to fall on a thin slit mounted vertically on a rigid optical bench fitted with a scale.


Slit, biprism and eyepiece should be adjusted to the same height. Now mica sheet is introduced bipprism the path of one wave.

Set the crosswire of eyepiece on one particular fringe and note the reading. The central white fringe is now shifted to another position of cross wire. Screen, white, x mm.

Determination of wave length of light. Amita Maurya, Peoples University, Bhopal.

Fresnel’s biprism experiment

Lateral shift of the fringes should be removed with the help of biprism and eyepiece. The position of this central white fringe is recorded by focusing the cross wire of eye piece on it and taking this reading of micrometer scale.

Applications of Fresnel’s Biprism. The optical bench should be levelled. Measure the distance between the virtual light sources and, using this and the interference pattern, determine the wavelength of red light.

Hence,S1andS2 act as two coherent sources. Plate mount for three objects. For this we make the use of displacement method.

Fresnel’s Biprism – Engineering Physics Class

New Products View our new products here. The vertical wire of the eyepiece is made to coincide with ffesnel of the fringes and screw of micrometer is moved sideways and number cresnel fringes is counted.


The crosswire is moved with the help of micrometer screw and reading is again noted. The eye piece can be moved in the plane perpendicular to the axis of bench using a micrometer based translation stage.

Benefits Multifunctional light box – All-in-one: The light emerging from the slit fall on the biprism. As expression for fringe width is. Now the lens is moved such that for another position of lens, again two images of slit are seen on eye piece.

Its two important applications are: A convex lens is placed between biprism and the eyepiece in such a way that for two positions of lens the image of virtual sources S 1 and S 2 are seen in eyepiece. Colour filter set, additive red, blue, green.

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