Fresnel’s BI-Prism Experiment

Description

Fresnel’s Bi-prism Experiment 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.

Experiment:

To find the wavelength of the He-Ne Laser using bi-prism experiment.

Product Detail:

• The apparatus consists of an optical Bench on which components are mounted using movable riders. For setting up the experiment, slit, eye piece and biprism are adjusted so as to obtain well defined bright and dark fringes. Here He-Ne Laser is used as light source.
• Optical Bench: For Bi-Prism Experiment, consists of two S.S rods, supported by heavy cast iron feet, provided with 4 metal riders. Two of the sliders have transverse motion and one rod is engraved in mms. Improved design, 46 inches long.
• Optical Slit: Optically true stainless jaws, spring action for opening of jaws eliminated to ensure original accuracy even after prolonged use. Jaws open uniformly all along through a milled head. Jaw alignment tested for optical accuracy.
• Fresnel’s Bi-Prism: Fresnel’s biprism consist of two prisms of very small angles joined base to base.

Technical Details

• Bi-Prism Holder: Bi-Prism holder has the fine radial motion by a fine pitch screw.
• Lens Holder: Lens holder is automatic spring action for equal opening and closing both sides.
• Micrometer Eyepiece: Ramsden Eyepiece, 10x, is carried on a slider which moves along a micrometer screw accurately made LC = 0.01 mm.

Scope of Learning:

• Ideally suited for simple, clear & easily comprehensive assemblies for interference, diffraction and holography experiments. The laser is constructed in such a way that is safe to use under any circumstances. Laser tubes alongwith SMPS power supply are housed in thick powdered coated aluminium Box. From the hole, the laser beam comes out.

Technical Specification:

• Operating Wavelength : 632.8nm (RED)
• Beam Diameter : 0.8mm
• Beam Divergence : < 1mrad
• Polarisation random :(unpolarised)
• Mode : TEM
• Output Power Stability : ±2.5%
• Power Input : 220V AC ± 10%, 50Hz
• Min. Operating Life time: 15,000Hrs.
• Shelf Life : 10 years