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

Options

  1. AThere will be a central dark fringe surrounded by a few coloured fringes
  2. BThere will be a central bright white fringe surrounded by a few coloured fringes
  3. CAll bright fringes will be of equal width
  4. DInterference pattern will disappear

Correct answer

B. There will be a central bright white fringe surrounded by a few coloured fringes

Step-by-step solution

At central point on screen, path difference is zero for all wavelength. So, central bright fringe is white and other fringes depend on wavelength as = D d . Therefore, other fringes will be coloured.

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