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PhysicsNEET 2024Interference and Young's double slit

Wave Optics

If the monochromatic source in Young's double slit experiment is replaced by white light, then:

  1. A.There will be a central dark fringe surrounded by a few coloured fringes
  2. B.There will be a central bright white fringe surrounded by a few coloured fringes✓
  3. C.All bright fringes will be of equal width
  4. D.Interference pattern will disappear

Solution

With white light every wavelength produces a bright fringe at the centre (zero path difference), so the central fringe is white; on either side the different colours spread at different fringe widths and only a few coloured fringes are seen before they wash out.

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