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Interference of light Exercise

  1. State the basic conditions for observing interference of light. What do you understand by Fresnel’s biprism and explain the formation of interference fringes by it? How do you determine the wavelength of monochromatic light by using Fresnel’s biprism experiment?
  2. Derive an expression for the diameter of nth dark ring in Newton’s ring formation by monochromatic light.
  3. Describe theory of colours of a thin film, under what conditions the film may appear dark? Using theory of thin films, how would you determine wavelength of given light?
  4. Explain formation of Newton’s rings in reflected light.
  5. Explain effect of introducing a thin plate of mica in the path of one of the interfering beams of Fresnel’s biprism. Deduce expression for displacement.
  6. Discuss formation of Newton’s rings by (i) reflected light (ii) transmitted light. Derive an expression for radius of nth dark ring in reflected light.
  7. Explain formation of Newton’s rings. Show how would you use them to determine the wavelength of sodium light. Derive formula used.
  8. What are coherent sources? Why two independent sources of light of same wavelength cannot show interference?
  9. What is interference of light? Discuss the necessary conditions for interference of light.
  10. Why is it necessary to have coherent sources for observing interference of light? Explain why fringes formed by a biprism disappear when the slit is made wide?