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Indian Scientific Instrument

Bi Prism

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Bi-prism has a highly obtuse angle to facilitate beam splitting. It an optical device used for obtaining interference fringes. It produces and control light. The device is in triangular shape and made of glass or quartz; used to deviates a beam or invert an image. There are different types of bi-prism which includes:
  • Fresnel Bi-Prism: The Fresnel Bi-prism overcomes the difficulty associated with the extended secondary slits by replacing them with “virtual slits”.
  • Electron Bi-Prism: I n order to obtain a large deflection angle without increasing the applied voltage to an electron bi-prism, we have developed a ‘twin-electron bi-prism’ (TBP), which is composed of two filament electrodes and a pair of ground plates.

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