Question:

: Interference is not observed if the two coherent slit sources are broad. : A broad source is equivalent to many narrow slit sources.

Updated On: Jul 6, 2022
  • If both assertion and reason are true and reason is the correct explanation of assertion
  • If both assertion and reason are true but reason is not the correct explanation of assertion
  • If assertion is true but reason is false
  • If both assertion and reason are false
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The Correct Option is A

Solution and Explanation

Coherent light from two narrow parallel slits will produce an interference pattern on a screen. A broad source is equivalent to a large number of parallel narrow slits, lying side by side. As there are many slits, there will be many overlapping interference patterns may be formed. The overlapping will be to such an extent that all traces of a fringe system will be lost. Thus almost even illumination will be observed. There will be no interference pattern seen. Thus for obtaining a distinct interference fringe pattern, a narrow slit is required.
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Notes on Wave optics

Concepts Used:

Wave Optics

  • Wave optics are also known as Physical optics which deal with the study of various phenomena such as polarization, interference, diffraction, and other occurrences where ray approximation of geometric optics cannot be done. Thus, the section of optics that deals with the behavior of light and its wave characteristics is known to be wave optics.
  • In wave optics, the approximation is carried out by utilizing ray optics for the estimation of the field on a surface. Further, it includes integrating a ray-estimated field over a mirror, lens, or aperture for the calculation of the transmitted or scattered field.
  • Wave optics stands as a witness to a famous standoff between two great scientific communities who devoted their lives to understanding the nature of light. Overall, one supports the particle nature of light; the other supports the wave nature.
  • Sir Isaac Newton stood as a pre-eminent figure that supported the voice of particle nature of light, he proposed a corpuscular theory which states that “light consists of extremely light and tiny particles, called corpuscles which travel with very high speeds from the source of light to create a sensation of vision by reflecting on the retina of the eye”.