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Fresnel's Biprism Diffraction

Apparatus

Model: HO-ED-D-07

Holmarc's Fresnel's biprism diffraction Apparatus (Model No: HO-ED-D-07) is an instrument that demonstrates how Fresnel's Bi prism can be used to obtain fringes due to interference and to calculate the wavelength of monochromatic light. Bi-prism produces interference pattern from a single source due to the creation of two virtual coherent sources as the light passes through the prism.

The apparatus consists of an optical rail on which components are mounted using posts, post holders and movable carriages. For setting up the experiment, the slit, eye piece and the biprism are adjusted so as to obtain well defined bright and dark fringes. Sodium vapour lamp is used as light source. All components are made out of anodized aluminum and stainless steel to avoid corrosion.

Fresnel's biprism consist of two prisms of very small angles joined base to base. In practice, a thin glass plate is taken and one of its faces is ground and polished till a prism is formed with an obtuse angle of about 179° and two side angles of the order 30 arc minutes. If a diverging beam of light strikes the edge of the biprism, two diverging coherent light beams are created which appear to emerge from two virtual slits and interfere on the far side of the biprism. Students gain knowledge of the general setup of the Fresnel experiment and the interference patterns. Research quality modules of the instrument can be used for project works as well.



Experiment Examples

    To find the wavelength of the sodium light using bi-prism diffraction experiment

Wavelength is given by


λ    =    β  D  /  d


If d is the distance between the two virtual sources S1 and S2, D is the distance between slit and the screen, λ is the wavelength of monochromatic radiation and β is the fridge width.



Related Topics

    Fresnel biprism

    Interferencebr

    Virtual coherent sources
Features

    Compact and integrated design

    Sodium vapor lamp as light source with light output port adjustable in length

    Precision lead screw driven slit provided with a maximum opening of 3mm

    Eyepiece with micrometer drive for achieving perfect linear motion

    Precision rotary coarse and fine adjustments with lead screw controller in biprism mount

    Achromatic lens is used for focusing image
Scope of Supply


    Optical Rail

Model No: ED-D-07-OR
Length
:
1200 mm
Material
:
Black anodized Aluminum alloy
Quantity
:
1 no.
Optical Rail

    Slit with Mount

Model No: ED-D-07-SM
Controlling
:
Lead screw
Slit Size
:
0 - 3mm
Quantity
:
1 no.
Slit with Mount

    Bi Prism Mount

Model No: ED-D-07-BM
Controlling
:
Lead screw
Dial movement Course
:
360 degree
Fine
:
10 degree
Quantity
:
1 no.
Bi Prism Mountt

    Achromatic Lens with Mount

Model No: ED-D-07-ALM
Focal length
:
202 mm
Diameter
:
50 mm
Quantity
:
5 nos.
Achromatic Lens with Mount

    Eye Piece with Micrometer Drive

Model No: ED-D-07-EPM
No. of Micrometers
:
2
Least Count
:
0.01 mm
Quantity
:
1 no.
Eye Piece with Micrometer Drive

    Screen with Mount

Model No: ED-D-07-SM
Material
:
Acrylic
Size
:
200 x 150 mm
Quantity
:
1 no.
Screen with Mount

    Bi Prism

Model No: ED-D-07-BP
Material
:
Borofloat
Quantity
:
1 no.
Bi Prism

    Sodium vapor lamp with Power Supply

Model No: ED-D-07-SLPS
Output Power
:
35 W
Quantity
:
1 no.
Sodium vapor lamp with Power Supply

    Accessories

User Manual
Allen Key

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