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Imperfections in optical lenses can be observed with the help of

Imperfections in optical lenses can be observed with the help of Correct Answer Fresnel's Biprism

CONCEPT:

Fresnel biprism:

  • The Fresnel biprism demonstrates the interference of light.
  • In Fresnel biprism, two thin prisms are joined at the base to form the isosceles triangle with a very small refracting angle of 0.5°.
  • Fresnel biprism is used to determine the thickness of the thin film, the refractive index of the medium, the wavelength of the source of light, etc.
  • When a monochromatic light source is kept in front of the biprism, two coherent virtual sources are produced.
  • Then the interference fringes are formed on the screen placed behind the biprism.
  • If a convex lens is mounted between the biprism and eyepiece, there will be two positions of the lens when the sharp images of coherent sources will be observed in the eyepiece.
  • The Fresnel biprism is also used to determine the imperfections in optical lenses.

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EXPLANATION:

  • The Fresnel biprism is used to determine the imperfections in optical lenses. Hence, option 2 is correct.

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